[Misc] Black auto fix. (#4642)

* [Misc] Black auto fix.

* sort
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

examples/pytorch/dimenet/modules/initializers.py

 import torch.nn as nn
 
+
 def GlorotOrthogonal(tensor, scale=2.0):
     if tensor is not None:
         nn.init.orthogonal_(tensor.data)
         scale /= (tensor.size(-2) + tensor.size(-1)) * tensor.var()
-        tensor.data *= scale.sqrt()
+        tensor.data *= scale.sqrt()
\ No newline at end of file

examples/pytorch/dimenet/modules/interaction_block.py

 import torch
 import torch.nn as nn
+from modules.initializers import GlorotOrthogonal
+from modules.residual_layer import ResidualLayer
+
 import dgl.function as fn
 
-from modules.residual_layer import ResidualLayer
-from modules.initializers import GlorotOrthogonal
 
 class InteractionBlock(nn.Module):
-    def __init__(self,
-                 emb_size,
-                 num_radial,
-                 num_spherical,
-                 num_bilinear,
-                 num_before_skip,
-                 num_after_skip,
-                 activation=None):
+    def __init__(
+        self,
+        emb_size,
+        num_radial,
+        num_spherical,
+        num_bilinear,
+        num_before_skip,
+        num_after_skip,
+        activation=None,
+    ):
         super(InteractionBlock, self).__init__()
 
         self.activation = activation
         # Transformations of Bessel and spherical basis representations
         self.dense_rbf = nn.Linear(num_radial, emb_size, bias=False)
-        self.dense_sbf = nn.Linear(num_radial * num_spherical, num_bilinear, bias=False)
+        self.dense_sbf = nn.Linear(
+            num_radial * num_spherical, num_bilinear, bias=False
+        )
         # Dense transformations of input messages
         self.dense_ji = nn.Linear(emb_size, emb_size)
         self.dense_kj = nn.Linear(emb_size, emb_size)
         # Bilinear layer
-        bilin_initializer = torch.empty((emb_size, num_bilinear, emb_size)).normal_(mean=0, std=2 / emb_size)
+        bilin_initializer = torch.empty(
+            (emb_size, num_bilinear, emb_size)
+        ).normal_(mean=0, std=2 / emb_size)
         self.W_bilin = nn.Parameter(bilin_initializer)
         # Residual layers before skip connection
-        self.layers_before_skip = nn.ModuleList([
-            ResidualLayer(emb_size, activation=activation) for _ in range(num_before_skip)
-        ])
+        self.layers_before_skip = nn.ModuleList(
+            [
+                ResidualLayer(emb_size, activation=activation)
+                for _ in range(num_before_skip)
+            ]
+        )
         self.final_before_skip = nn.Linear(emb_size, emb_size)
         # Residual layers after skip connection
-        self.layers_after_skip = nn.ModuleList([
-            ResidualLayer(emb_size, activation=activation) for _ in range(num_after_skip)
-        ])
+        self.layers_after_skip = nn.ModuleList(
+            [
+                ResidualLayer(emb_size, activation=activation)
+                for _ in range(num_after_skip)
+            ]
+        )
 
         self.reset_params()
-    
+
     def reset_params(self):
         GlorotOrthogonal(self.dense_rbf.weight)
         GlorotOrthogonal(self.dense_sbf.weight)
@@ -47,50 +60,52 @@ class InteractionBlock(nn.Module):
 
     def edge_transfer(self, edges):
         # Transform from Bessel basis to dence vector
-        rbf = self.dense_rbf(edges.data['rbf'])
+        rbf = self.dense_rbf(edges.data["rbf"])
         # Initial transformation
-        x_ji = self.dense_ji(edges.data['m'])
-        x_kj = self.dense_kj(edges.data['m'])
+        x_ji = self.dense_ji(edges.data["m"])
+        x_kj = self.dense_kj(edges.data["m"])
         if self.activation is not None:
             x_ji = self.activation(x_ji)
             x_kj = self.activation(x_kj)
 
         # w: W * e_RBF \bigodot \sigma(W * m + b)
-        return {'x_kj': x_kj * rbf, 'x_ji': x_ji}
+        return {"x_kj": x_kj * rbf, "x_ji": x_ji}
 
     def msg_func(self, edges):
-        sbf = self.dense_sbf(edges.data['sbf'])
+        sbf = self.dense_sbf(edges.data["sbf"])
         # Apply bilinear layer to interactions and basis function activation
         # [None, 8] * [128, 8, 128] * [None, 128] -> [None, 128]
-        x_kj = torch.einsum("wj,wl,ijl->wi", sbf, edges.src['x_kj'], self.W_bilin)
-        return {'x_kj': x_kj}
+        x_kj = torch.einsum(
+            "wj,wl,ijl->wi", sbf, edges.src["x_kj"], self.W_bilin
+        )
+        return {"x_kj": x_kj}
 
     def forward(self, g, l_g):
         g.apply_edges(self.edge_transfer)
-        
+
         # nodes correspond to edges and edges correspond to nodes in the original graphs
         # node: d, rbf, o, rbf_env, x_kj, x_ji
         for k, v in g.edata.items():
             l_g.ndata[k] = v
 
-        l_g.update_all(self.msg_func, fn.sum('x_kj', 'm_update'))
+        l_g.update_all(self.msg_func, fn.sum("x_kj", "m_update"))
 
         for k, v in l_g.ndata.items():
             g.edata[k] = v
 
         # Transformations before skip connection
-        g.edata['m_update'] = g.edata['m_update'] + g.edata['x_ji']
+        g.edata["m_update"] = g.edata["m_update"] + g.edata["x_ji"]
         for layer in self.layers_before_skip:
-            g.edata['m_update'] = layer(g.edata['m_update'])
-        g.edata['m_update'] = self.final_before_skip(g.edata['m_update'])
+            g.edata["m_update"] = layer(g.edata["m_update"])
+        g.edata["m_update"] = self.final_before_skip(g.edata["m_update"])
         if self.activation is not None:
-            g.edata['m_update'] = self.activation(g.edata['m_update'])
+            g.edata["m_update"] = self.activation(g.edata["m_update"])
 
         # Skip connection
-        g.edata['m'] = g.edata['m'] + g.edata['m_update']
+        g.edata["m"] = g.edata["m"] + g.edata["m_update"]
 
         # Transformations after skip connection
         for layer in self.layers_after_skip:
-            g.edata['m'] = layer(g.edata['m'])
+            g.edata["m"] = layer(g.edata["m"])
 
-        return g
+        return g
\ No newline at end of file

examples/pytorch/dimenet/modules/interaction_pp_block.py

 import torch.nn as nn
+from modules.initializers import GlorotOrthogonal
+from modules.residual_layer import ResidualLayer
+
 import dgl
 import dgl.function as fn
 
-from modules.residual_layer import ResidualLayer
-from modules.initializers import GlorotOrthogonal
 
 class InteractionPPBlock(nn.Module):
-    def __init__(self,
-                 emb_size,
-                 int_emb_size,
-                 basis_emb_size,
-                 num_radial,
-                 num_spherical,
-                 num_before_skip,
-                 num_after_skip,
-                 activation=None):
+    def __init__(
+        self,
+        emb_size,
+        int_emb_size,
+        basis_emb_size,
+        num_radial,
+        num_spherical,
+        num_before_skip,
+        num_after_skip,
+        activation=None,
+    ):
         super(InteractionPPBlock, self).__init__()
 
         self.activation = activation
         # Transformations of Bessel and spherical basis representations
         self.dense_rbf1 = nn.Linear(num_radial, basis_emb_size, bias=False)
         self.dense_rbf2 = nn.Linear(basis_emb_size, emb_size, bias=False)
-        self.dense_sbf1 = nn.Linear(num_radial * num_spherical, basis_emb_size, bias=False)
+        self.dense_sbf1 = nn.Linear(
+            num_radial * num_spherical, basis_emb_size, bias=False
+        )
         self.dense_sbf2 = nn.Linear(basis_emb_size, int_emb_size, bias=False)
         # Dense transformations of input messages
         self.dense_ji = nn.Linear(emb_size, emb_size)
@@ -30,17 +35,23 @@ class InteractionPPBlock(nn.Module):
         self.down_projection = nn.Linear(emb_size, int_emb_size, bias=False)
         self.up_projection = nn.Linear(int_emb_size, emb_size, bias=False)
         # Residual layers before skip connection
-        self.layers_before_skip = nn.ModuleList([
-            ResidualLayer(emb_size, activation=activation) for _ in range(num_before_skip)
-        ])
+        self.layers_before_skip = nn.ModuleList(
+            [
+                ResidualLayer(emb_size, activation=activation)
+                for _ in range(num_before_skip)
+            ]
+        )
         self.final_before_skip = nn.Linear(emb_size, emb_size)
         # Residual layers after skip connection
-        self.layers_after_skip = nn.ModuleList([
-            ResidualLayer(emb_size, activation=activation) for _ in range(num_after_skip)
-        ])
+        self.layers_after_skip = nn.ModuleList(
+            [
+                ResidualLayer(emb_size, activation=activation)
+                for _ in range(num_after_skip)
+            ]
+        )
 
         self.reset_params()
-    
+
     def reset_params(self):
         GlorotOrthogonal(self.dense_rbf1.weight)
         GlorotOrthogonal(self.dense_rbf2.weight)
@@ -55,11 +66,11 @@ class InteractionPPBlock(nn.Module):
 
     def edge_transfer(self, edges):
         # Transform from Bessel basis to dense vector
-        rbf = self.dense_rbf1(edges.data['rbf'])
+        rbf = self.dense_rbf1(edges.data["rbf"])
         rbf = self.dense_rbf2(rbf)
         # Initial transformation
-        x_ji = self.dense_ji(edges.data['m'])
-        x_kj = self.dense_kj(edges.data['m'])
+        x_ji = self.dense_ji(edges.data["m"])
+        x_kj = self.dense_kj(edges.data["m"])
         if self.activation is not None:
             x_ji = self.activation(x_ji)
             x_kj = self.activation(x_kj)
@@ -67,41 +78,41 @@ class InteractionPPBlock(nn.Module):
         x_kj = self.down_projection(x_kj * rbf)
         if self.activation is not None:
             x_kj = self.activation(x_kj)
-        return {'x_kj': x_kj, 'x_ji': x_ji}
+        return {"x_kj": x_kj, "x_ji": x_ji}
 
     def msg_func(self, edges):
-        sbf = self.dense_sbf1(edges.data['sbf'])
+        sbf = self.dense_sbf1(edges.data["sbf"])
         sbf = self.dense_sbf2(sbf)
-        x_kj = edges.src['x_kj'] * sbf
-        return {'x_kj': x_kj}
+        x_kj = edges.src["x_kj"] * sbf
+        return {"x_kj": x_kj}
 
     def forward(self, g, l_g):
         g.apply_edges(self.edge_transfer)
-        
+
         # nodes correspond to edges and edges correspond to nodes in the original graphs
         # node: d, rbf, o, rbf_env, x_kj, x_ji
         for k, v in g.edata.items():
             l_g.ndata[k] = v
 
         l_g_reverse = dgl.reverse(l_g, copy_edata=True)
-        l_g_reverse.update_all(self.msg_func, fn.sum('x_kj', 'm_update'))
+        l_g_reverse.update_all(self.msg_func, fn.sum("x_kj", "m_update"))
 
-        g.edata['m_update'] = self.up_projection(l_g_reverse.ndata['m_update'])
+        g.edata["m_update"] = self.up_projection(l_g_reverse.ndata["m_update"])
         if self.activation is not None:
-            g.edata['m_update'] = self.activation(g.edata['m_update'])
+            g.edata["m_update"] = self.activation(g.edata["m_update"])
         # Transformations before skip connection
-        g.edata['m_update'] = g.edata['m_update'] + g.edata['x_ji']
+        g.edata["m_update"] = g.edata["m_update"] + g.edata["x_ji"]
         for layer in self.layers_before_skip:
-            g.edata['m_update'] = layer(g.edata['m_update'])
-        g.edata['m_update'] = self.final_before_skip(g.edata['m_update'])
+            g.edata["m_update"] = layer(g.edata["m_update"])
+        g.edata["m_update"] = self.final_before_skip(g.edata["m_update"])
         if self.activation is not None:
-            g.edata['m_update'] = self.activation(g.edata['m_update'])
+            g.edata["m_update"] = self.activation(g.edata["m_update"])
 
         # Skip connection
-        g.edata['m'] = g.edata['m'] + g.edata['m_update']
+        g.edata["m"] = g.edata["m"] + g.edata["m_update"]
 
         # Transformations after skip connection
         for layer in self.layers_after_skip:
-            g.edata['m'] = layer(g.edata['m'])
+            g.edata["m"] = layer(g.edata["m"])
 
-        return g
+        return g
\ No newline at end of file

examples/pytorch/dimenet/modules/output_block.py

 import torch.nn as nn
+from modules.initializers import GlorotOrthogonal
+
 import dgl
 import dgl.function as fn
 
-from modules.initializers import GlorotOrthogonal
 
 class OutputBlock(nn.Module):
-    def __init__(self,
-                 emb_size,
-                 num_radial,
-                 num_dense,
-                 num_targets,
-                 activation=None,
-                 output_init=nn.init.zeros_):
+    def __init__(
+        self,
+        emb_size,
+        num_radial,
+        num_dense,
+        num_targets,
+        activation=None,
+        output_init=nn.init.zeros_,
+    ):
         super(OutputBlock, self).__init__()
 
         self.activation = activation
         self.output_init = output_init
         self.dense_rbf = nn.Linear(num_radial, emb_size, bias=False)
-        self.dense_layers = nn.ModuleList([
-            nn.Linear(emb_size, emb_size) for _ in range(num_dense)
-        ])
+        self.dense_layers = nn.ModuleList(
+            [nn.Linear(emb_size, emb_size) for _ in range(num_dense)]
+        )
         self.dense_final = nn.Linear(emb_size, num_targets, bias=False)
         self.reset_params()
-    
+
     def reset_params(self):
         GlorotOrthogonal(self.dense_rbf.weight)
         for layer in self.dense_layers:
@@ -31,12 +34,12 @@ class OutputBlock(nn.Module):
 
     def forward(self, g):
         with g.local_scope():
-            g.edata['tmp'] = g.edata['m'] * self.dense_rbf(g.edata['rbf'])
-            g.update_all(fn.copy_e('tmp', 'x'), fn.sum('x', 't'))
+            g.edata["tmp"] = g.edata["m"] * self.dense_rbf(g.edata["rbf"])
+            g.update_all(fn.copy_e("tmp", "x"), fn.sum("x", "t"))
 
             for layer in self.dense_layers:
-                g.ndata['t'] = layer(g.ndata['t'])
+                g.ndata["t"] = layer(g.ndata["t"])
                 if self.activation is not None:
-                    g.ndata['t'] = self.activation(g.ndata['t'])
-            g.ndata['t'] = self.dense_final(g.ndata['t'])
-            return dgl.readout_nodes(g, 't')
+                    g.ndata["t"] = self.activation(g.ndata["t"])
+            g.ndata["t"] = self.dense_final(g.ndata["t"])
+            return dgl.readout_nodes(g, "t")
\ No newline at end of file

examples/pytorch/dimenet/modules/output_pp_block.py

 import torch.nn as nn
+from modules.initializers import GlorotOrthogonal
+
 import dgl
 import dgl.function as fn
 
-from modules.initializers import GlorotOrthogonal
 
 class OutputPPBlock(nn.Module):
-    def __init__(self,
-                 emb_size,
-                 out_emb_size,
-                 num_radial,
-                 num_dense,
-                 num_targets,
-                 activation=None,
-                 output_init=nn.init.zeros_,
-                 extensive=True):
+    def __init__(
+        self,
+        emb_size,
+        out_emb_size,
+        num_radial,
+        num_dense,
+        num_targets,
+        activation=None,
+        output_init=nn.init.zeros_,
+        extensive=True,
+    ):
         super(OutputPPBlock, self).__init__()
 
         self.activation = activation
@@ -21,12 +24,12 @@ class OutputPPBlock(nn.Module):
         self.extensive = extensive
         self.dense_rbf = nn.Linear(num_radial, emb_size, bias=False)
         self.up_projection = nn.Linear(emb_size, out_emb_size, bias=False)
-        self.dense_layers = nn.ModuleList([
-            nn.Linear(out_emb_size, out_emb_size) for _ in range(num_dense)
-        ])
+        self.dense_layers = nn.ModuleList(
+            [nn.Linear(out_emb_size, out_emb_size) for _ in range(num_dense)]
+        )
         self.dense_final = nn.Linear(out_emb_size, num_targets, bias=False)
         self.reset_params()
-    
+
     def reset_params(self):
         GlorotOrthogonal(self.dense_rbf.weight)
         GlorotOrthogonal(self.up_projection.weight)
@@ -36,14 +39,16 @@ class OutputPPBlock(nn.Module):
 
     def forward(self, g):
         with g.local_scope():
-            g.edata['tmp'] = g.edata['m'] * self.dense_rbf(g.edata['rbf'])
+            g.edata["tmp"] = g.edata["m"] * self.dense_rbf(g.edata["rbf"])
             g_reverse = dgl.reverse(g, copy_edata=True)
-            g_reverse.update_all(fn.copy_e('tmp', 'x'), fn.sum('x', 't'))
-            g.ndata['t'] = self.up_projection(g_reverse.ndata['t'])
-            
+            g_reverse.update_all(fn.copy_e("tmp", "x"), fn.sum("x", "t"))
+            g.ndata["t"] = self.up_projection(g_reverse.ndata["t"])
+
             for layer in self.dense_layers:
-                g.ndata['t'] = layer(g.ndata['t'])
+                g.ndata["t"] = layer(g.ndata["t"])
                 if self.activation is not None:
-                    g.ndata['t'] = self.activation(g.ndata['t'])
-            g.ndata['t'] = self.dense_final(g.ndata['t'])
-            return dgl.readout_nodes(g, 't', op='sum' if self.extensive else 'mean')
+                    g.ndata["t"] = self.activation(g.ndata["t"])
+            g.ndata["t"] = self.dense_final(g.ndata["t"])
+            return dgl.readout_nodes(
\ No newline at end of file
+                g, "t", op="sum" if self.extensive else "mean"
+            )

examples/pytorch/dimenet/modules/residual_layer.py

 import torch.nn as nn
-
 from modules.initializers import GlorotOrthogonal
 
+
 class ResidualLayer(nn.Module):
     def __init__(self, units, activation=None):
         super(ResidualLayer, self).__init__()
@@ -9,9 +9,9 @@ class ResidualLayer(nn.Module):
         self.activation = activation
         self.dense_1 = nn.Linear(units, units)
         self.dense_2 = nn.Linear(units, units)
-    
+
         self.reset_params()
-    
+
     def reset_params(self):
         GlorotOrthogonal(self.dense_1.weight)
         nn.init.zeros_(self.dense_1.bias)
@@ -25,4 +25,4 @@ class ResidualLayer(nn.Module):
         x = self.dense_2(x)
         if self.activation is not None:
             x = self.activation(x)
-        return inputs + x
+        return inputs + x
\ No newline at end of file

examples/pytorch/dimenet/modules/spherical_basis_layer.py

 import sympy as sym
 import torch
 import torch.nn as nn
-
 from modules.basis_utils import bessel_basis, real_sph_harm
 from modules.envelope import Envelope
 
+
 class SphericalBasisLayer(nn.Module):
-    def __init__(self,
-                 num_spherical,
-                 num_radial,
-                 cutoff,
-                 envelope_exponent=5):
+    def __init__(self, num_spherical, num_radial, cutoff, envelope_exponent=5):
         super(SphericalBasisLayer, self).__init__()
 
         assert num_radial <= 64
@@ -20,26 +16,38 @@ class SphericalBasisLayer(nn.Module):
         self.envelope = Envelope(envelope_exponent)
 
         # retrieve formulas
-        self.bessel_formulas = bessel_basis(num_spherical, num_radial)  # x, [num_spherical, num_radial] sympy functions
-        self.sph_harm_formulas = real_sph_harm(num_spherical)  # theta, [num_spherical, ] sympy functions
+        self.bessel_formulas = bessel_basis(
+            num_spherical, num_radial
+        )  # x, [num_spherical, num_radial] sympy functions
+        self.sph_harm_formulas = real_sph_harm(
+            num_spherical
+        )  # theta, [num_spherical, ] sympy functions
         self.sph_funcs = []
         self.bessel_funcs = []
 
         # convert to torch functions
-        x = sym.symbols('x')
-        theta = sym.symbols('theta')
-        modules = {'sin': torch.sin, 'cos': torch.cos}
+        x = sym.symbols("x")
+        theta = sym.symbols("theta")
+        modules = {"sin": torch.sin, "cos": torch.cos}
         for i in range(num_spherical):
             if i == 0:
-                first_sph = sym.lambdify([theta], self.sph_harm_formulas[i][0], modules)(0)
-                self.sph_funcs.append(lambda tensor: torch.zeros_like(tensor) + first_sph)
+                first_sph = sym.lambdify(
+                    [theta], self.sph_harm_formulas[i][0], modules
+                )(0)
+                self.sph_funcs.append(
+                    lambda tensor: torch.zeros_like(tensor) + first_sph
+                )
             else:
-                self.sph_funcs.append(sym.lambdify([theta], self.sph_harm_formulas[i][0], modules))
+                self.sph_funcs.append(
+                    sym.lambdify([theta], self.sph_harm_formulas[i][0], modules)
+                )
             for j in range(num_radial):
-                self.bessel_funcs.append(sym.lambdify([x], self.bessel_formulas[i][j], modules))
+                self.bessel_funcs.append(
+                    sym.lambdify([x], self.bessel_formulas[i][j], modules)
+                )
 
     def get_bessel_funcs(self):
         return self.bessel_funcs
 
     def get_sph_funcs(self):
-        return self.sph_funcs
+        return self.sph_funcs
\ No newline at end of file

examples/pytorch/dimenet/qm9.py

 """QM9 dataset for graph property prediction (regression)."""
 import os
+
 import numpy as np
 import scipy.sparse as sp
 import torch
-import dgl
-
 from tqdm import trange
+
+import dgl
+from dgl.convert import graph as dgl_graph
 from dgl.data import QM9Dataset
 from dgl.data.utils import load_graphs, save_graphs
-from dgl.convert import graph as dgl_graph
+
 
 class QM9(QM9Dataset):
     r"""QM9 dataset for graph property prediction (regression)
@@ -16,11 +18,11 @@ class QM9(QM9Dataset):
     This dataset consists of 130,831 molecules with 12 regression targets.
     Nodes correspond to atoms and edges correspond to bonds.
 
-    Reference: 
-    
+    Reference:
+
     - `"Quantum-Machine.org" <http://quantum-machine.org/datasets/>`_
     - `"Directional Message Passing for Molecular Graphs" <https://arxiv.org/abs/2003.03123>`_
-    
+
     Statistics:
 
     - Number of graphs: 130,831
@@ -53,7 +55,7 @@ class QM9(QM9Dataset):
     +--------+----------------------------------+-----------------------------------------------------------------------------------+---------------------------------------------+
     | Cv     | :math:`c_{\textrm{v}}`           | Heat capavity at 298.15K                                                          | :math:`\frac{\textrm{cal}}{\textrm{mol K}}` |
     +--------+----------------------------------+-----------------------------------------------------------------------------------+---------------------------------------------+
-    
+
     Parameters
     ----------
     label_keys: list
@@ -75,12 +77,12 @@ class QM9(QM9Dataset):
     ----------
     num_labels : int
         Number of labels for each graph, i.e. number of prediction tasks
-    
+
     Raises
     ------
     UserWarning
         If the raw data is changed in the remote server by the author.
-    
+
     Examples
     --------
     >>> data = QM9Dataset(label_keys=['mu', 'gap'], cutoff=5.0)
@@ -95,70 +97,94 @@ class QM9(QM9Dataset):
     >>>
     """
 
-    def __init__(self,
-                 label_keys,
-                 edge_funcs=None,
-                 cutoff=5.0,
-                 raw_dir=None,
-                 force_reload=False,
-                 verbose=False):
+    def __init__(
+        self,
+        label_keys,
+        edge_funcs=None,
+        cutoff=5.0,
+        raw_dir=None,
+        force_reload=False,
+        verbose=False,
+    ):
 
         self.edge_funcs = edge_funcs
-        self._keys = ['mu', 'alpha', 'homo', 'lumo', 'gap', 'r2', 'zpve', 'U0', 'U', 'H', 'G', 'Cv']
-
-        super(QM9, self).__init__(label_keys=label_keys,
-                                  cutoff=cutoff,
-                                  raw_dir=raw_dir,
-                                  force_reload=force_reload,
-                                  verbose=verbose)
+        self._keys = [
+            "mu",
+            "alpha",
+            "homo",
+            "lumo",
+            "gap",
+            "r2",
+            "zpve",
+            "U0",
+            "U",
+            "H",
+            "G",
+            "Cv",
+        ]
+
+        super(QM9, self).__init__(
+            label_keys=label_keys,
+            cutoff=cutoff,
+            raw_dir=raw_dir,
+            force_reload=force_reload,
+            verbose=verbose,
+        )
 
     def has_cache(self):
-        """ step 1, if True, goto step 5; else goto download(step 2), then step 3"""
-        graph_path = f'{self.save_path}/dgl_graph.bin'
-        line_graph_path = f'{self.save_path}/dgl_line_graph.bin'
+        """step 1, if True, goto step 5; else goto download(step 2), then step 3"""
+        graph_path = f"{self.save_path}/dgl_graph.bin"
+        line_graph_path = f"{self.save_path}/dgl_line_graph.bin"
         return os.path.exists(graph_path) and os.path.exists(line_graph_path)
 
     def process(self):
-        """ step 3 """
-        npz_path = f'{self.raw_dir}/qm9_eV.npz'
+        """step 3"""
+        npz_path = f"{self.raw_dir}/qm9_eV.npz"
         data_dict = np.load(npz_path, allow_pickle=True)
         # data_dict['N'] contains the number of atoms in each molecule,
         # data_dict['R'] consists of the atomic coordinates,
         # data_dict['Z'] consists of the atomic numbers.
         # Atomic properties (Z and R) of all molecules are concatenated as single tensors,
         # so you need this value to select the correct atoms for each molecule.
-        self.N = data_dict['N']
-        self.R = data_dict['R']
-        self.Z = data_dict['Z']
+        self.N = data_dict["N"]
+        self.R = data_dict["R"]
+        self.Z = data_dict["Z"]
         self.N_cumsum = np.concatenate([[0], np.cumsum(self.N)])
         # graph labels
         self.label_dict = {}
         for k in self._keys:
             self.label_dict[k] = torch.tensor(data_dict[k], dtype=torch.float32)
 
-        self.label = torch.stack([self.label_dict[key] for key in self.label_keys], dim=1)
+        self.label = torch.stack(
+            [self.label_dict[key] for key in self.label_keys], dim=1
+        )
         # graphs & features
         self.graphs, self.line_graphs = self._load_graph()
-    
+
     def _load_graph(self):
         num_graphs = self.label.shape[0]
         graphs = []
         line_graphs = []
-        
+
         for idx in trange(num_graphs):
             n_atoms = self.N[idx]
             # get all the atomic coordinates of the idx-th molecular graph
-            R = self.R[self.N_cumsum[idx]:self.N_cumsum[idx + 1]]
+            R = self.R[self.N_cumsum[idx] : self.N_cumsum[idx + 1]]
             # calculate the distance between all atoms
             dist = np.linalg.norm(R[:, None, :] - R[None, :, :], axis=-1)
             # keep all edges that don't exceed the cutoff and delete self-loops
-            adj = sp.csr_matrix(dist <= self.cutoff) - sp.eye(n_atoms, dtype=np.bool)
+            adj = sp.csr_matrix(dist <= self.cutoff) - sp.eye(
+                n_atoms, dtype=np.bool
+            )
             adj = adj.tocoo()
             u, v = torch.tensor(adj.row), torch.tensor(adj.col)
             g = dgl_graph((u, v))
-            g.ndata['R'] = torch.tensor(R, dtype=torch.float32)
-            g.ndata['Z'] = torch.tensor(self.Z[self.N_cumsum[idx]:self.N_cumsum[idx + 1]], dtype=torch.long)
-            
+            g.ndata["R"] = torch.tensor(R, dtype=torch.float32)
+            g.ndata["Z"] = torch.tensor(
+                self.Z[self.N_cumsum[idx] : self.N_cumsum[idx + 1]],
+                dtype=torch.long,
+            )
+
             # add user-defined features
             if self.edge_funcs is not None:
                 for func in self.edge_funcs:
@@ -167,32 +193,34 @@ class QM9(QM9Dataset):
             graphs.append(g)
             l_g = dgl.line_graph(g, backtracking=False)
             line_graphs.append(l_g)
-    
+
         return graphs, line_graphs
 
     def save(self):
-        """ step 4 """
-        graph_path = f'{self.save_path}/dgl_graph.bin'
-        line_graph_path = f'{self.save_path}/dgl_line_graph.bin'
+        """step 4"""
+        graph_path = f"{self.save_path}/dgl_graph.bin"
+        line_graph_path = f"{self.save_path}/dgl_line_graph.bin"
         save_graphs(str(graph_path), self.graphs, self.label_dict)
         save_graphs(str(line_graph_path), self.line_graphs)
 
     def load(self):
-        """ step 5 """
-        graph_path = f'{self.save_path}/dgl_graph.bin'
-        line_graph_path = f'{self.save_path}/dgl_line_graph.bin'
+        """step 5"""
+        graph_path = f"{self.save_path}/dgl_graph.bin"
+        line_graph_path = f"{self.save_path}/dgl_line_graph.bin"
         self.graphs, label_dict = load_graphs(graph_path)
         self.line_graphs, _ = load_graphs(line_graph_path)
-        self.label = torch.stack([label_dict[key] for key in self.label_keys], dim=1)
+        self.label = torch.stack(
+            [label_dict[key] for key in self.label_keys], dim=1
+        )
 
     def __getitem__(self, idx):
-        r""" Get graph and label by index
+        r"""Get graph and label by index
 
         Parameters
         ----------
         idx : int
             Item index
-        
+
         Returns
         -------
         dgl.DGLGraph

examples/pytorch/dtgrnn/dataloading.py

 import os
 import ssl
-from six.moves import urllib
-import torch
+
 import numpy as np
+import torch
+from six.moves import urllib
+from torch.utils.data import DataLoader, Dataset
+
 import dgl
-from torch.utils.data import Dataset, DataLoader
 
 
 def download_file(dataset):
     print("Start Downloading data: {}".format(dataset))
     url = "https://s3.us-west-2.amazonaws.com/dgl-data/dataset/{}".format(
-        dataset)
+        dataset
+    )
     print("Start Downloading File....")
     context = ssl._create_unverified_context()
     data = urllib.request.urlopen(url, context=context)
@@ -20,13 +23,13 @@ def download_file(dataset):
 
 class SnapShotDataset(Dataset):
     def __init__(self, path, npz_file):
-        if not os.path.exists(path+'/'+npz_file):
+        if not os.path.exists(path + "/" + npz_file):
             if not os.path.exists(path):
                 os.mkdir(path)
             download_file(npz_file)
-        zipfile = np.load(path+'/'+npz_file)
-        self.x = zipfile['x']
-        self.y = zipfile['y']
+        zipfile = np.load(path + "/" + npz_file)
+        self.x = zipfile["x"]
+        self.y = zipfile["y"]
 
     def __len__(self):
         return len(self.x)
@@ -39,54 +42,52 @@ class SnapShotDataset(Dataset):
 
 
 def METR_LAGraphDataset():
-    if not os.path.exists('data/graph_la.bin'):
-        if not os.path.exists('data'):
-            os.mkdir('data')
-        download_file('graph_la.bin')
-    g, _ = dgl.load_graphs('data/graph_la.bin')
+    if not os.path.exists("data/graph_la.bin"):
+        if not os.path.exists("data"):
+            os.mkdir("data")
+        download_file("graph_la.bin")
+    g, _ = dgl.load_graphs("data/graph_la.bin")
     return g[0]
 
 
 class METR_LATrainDataset(SnapShotDataset):
     def __init__(self):
-        super(METR_LATrainDataset, self).__init__('data', 'metr_la_train.npz')
+        super(METR_LATrainDataset, self).__init__("data", "metr_la_train.npz")
         self.mean = self.x[..., 0].mean()
         self.std = self.x[..., 0].std()
 
 
 class METR_LATestDataset(SnapShotDataset):
     def __init__(self):
-        super(METR_LATestDataset, self).__init__('data', 'metr_la_test.npz')
+        super(METR_LATestDataset, self).__init__("data", "metr_la_test.npz")
 
 
 class METR_LAValidDataset(SnapShotDataset):
     def __init__(self):
-        super(METR_LAValidDataset, self).__init__('data', 'metr_la_valid.npz')
+        super(METR_LAValidDataset, self).__init__("data", "metr_la_valid.npz")
 
 
 def PEMS_BAYGraphDataset():
-    if not os.path.exists('data/graph_bay.bin'):
-        if not os.path.exists('data'):
-            os.mkdir('data')
-        download_file('graph_bay.bin')
-    g, _ = dgl.load_graphs('data/graph_bay.bin')
+    if not os.path.exists("data/graph_bay.bin"):
+        if not os.path.exists("data"):
+            os.mkdir("data")
+        download_file("graph_bay.bin")
+    g, _ = dgl.load_graphs("data/graph_bay.bin")
     return g[0]
 
 
 class PEMS_BAYTrainDataset(SnapShotDataset):
     def __init__(self):
-        super(PEMS_BAYTrainDataset, self).__init__(
-            'data', 'pems_bay_train.npz')
+        super(PEMS_BAYTrainDataset, self).__init__("data", "pems_bay_train.npz")
         self.mean = self.x[..., 0].mean()
         self.std = self.x[..., 0].std()
 
 
 class PEMS_BAYTestDataset(SnapShotDataset):
     def __init__(self):
-        super(PEMS_BAYTestDataset, self).__init__('data', 'pems_bay_test.npz')
+        super(PEMS_BAYTestDataset, self).__init__("data", "pems_bay_test.npz")
 
 
 class PEMS_BAYValidDataset(SnapShotDataset):
     def __init__(self):
-        super(PEMS_BAYValidDataset, self).__init__(
-            'data', 'pems_bay_valid.npz')
+        super(PEMS_BAYValidDataset, self).__init__("data", "pems_bay_valid.npz")

examples/pytorch/dtgrnn/dcrnn.py

@@ -2,13 +2,14 @@ import numpy as np
 import scipy.sparse as sparse
 import torch
 import torch.nn as nn
+
 import dgl
-from dgl.base import DGLError
 import dgl.function as fn
+from dgl.base import DGLError
 
 
 class DiffConv(nn.Module):
-    '''DiffConv is the implementation of diffusion convolution from paper DCRNN
+    """DiffConv is the implementation of diffusion convolution from paper DCRNN
     It will compute multiple diffusion matrix and perform multiple diffusion conv on it,
     this layer can be used for traffic prediction, pedamic model.
     Parameter
@@ -25,20 +26,23 @@ class DiffConv(nn.Module):
     dir : str [both/in/out]
         direction of diffusion convolution
         From paper default both direction
-    '''
+    """
 
-    def __init__(self, in_feats, out_feats, k, in_graph_list, out_graph_list, dir='both'):
+    def __init__(
+        self, in_feats, out_feats, k, in_graph_list, out_graph_list, dir="both"
+    ):
         super(DiffConv, self).__init__()
         self.in_feats = in_feats
         self.out_feats = out_feats
         self.k = k
         self.dir = dir
-        self.num_graphs = self.k-1 if self.dir == 'both' else 2*self.k-2
+        self.num_graphs = self.k - 1 if self.dir == "both" else 2 * self.k - 2
         self.project_fcs = nn.ModuleList()
         for i in range(self.num_graphs):
             self.project_fcs.append(
-                nn.Linear(self.in_feats, self.out_feats, bias=False))
-        self.merger = nn.Parameter(torch.randn(self.num_graphs+1))
+                nn.Linear(self.in_feats, self.out_feats, bias=False)
+            )
+        self.merger = nn.Parameter(torch.randn(self.num_graphs + 1))
         self.in_graph_list = in_graph_list
         self.out_graph_list = out_graph_list
 
@@ -48,62 +52,68 @@ class DiffConv(nn.Module):
         out_graph_list = []
         in_graph_list = []
         wadj, ind, outd = DiffConv.get_weight_matrix(g)
-        adj = sparse.coo_matrix(wadj/outd.cpu().numpy())
-        outg = dgl.from_scipy(adj, eweight_name='weight').to(device)
-        outg.edata['weight'] = outg.edata['weight'].float().to(device)
+        adj = sparse.coo_matrix(wadj / outd.cpu().numpy())
+        outg = dgl.from_scipy(adj, eweight_name="weight").to(device)
+        outg.edata["weight"] = outg.edata["weight"].float().to(device)
         out_graph_list.append(outg)
-        for i in range(k-1):
-            out_graph_list.append(DiffConv.diffuse(
-                out_graph_list[-1], wadj, outd))
-        adj = sparse.coo_matrix(wadj.T/ind.cpu().numpy())
-        ing = dgl.from_scipy(adj, eweight_name='weight').to(device)
-        ing.edata['weight'] = ing.edata['weight'].float().to(device)
+        for i in range(k - 1):
+            out_graph_list.append(
+                DiffConv.diffuse(out_graph_list[-1], wadj, outd)
+            )
+        adj = sparse.coo_matrix(wadj.T / ind.cpu().numpy())
+        ing = dgl.from_scipy(adj, eweight_name="weight").to(device)
+        ing.edata["weight"] = ing.edata["weight"].float().to(device)
         in_graph_list.append(ing)
-        for i in range(k-1):
-            in_graph_list.append(DiffConv.diffuse(
-                in_graph_list[-1], wadj.T, ind))
+        for i in range(k - 1):
+            in_graph_list.append(
+                DiffConv.diffuse(in_graph_list[-1], wadj.T, ind)
+            )
         return out_graph_list, in_graph_list
 
     @staticmethod
     def get_weight_matrix(g):
-        adj = g.adj(scipy_fmt='coo')
+        adj = g.adj(scipy_fmt="coo")
         ind = g.in_degrees()
         outd = g.out_degrees()
-        weight = g.edata['weight']
+        weight = g.edata["weight"]
         adj.data = weight.cpu().numpy()
         return adj, ind, outd
 
     @staticmethod
     def diffuse(progress_g, weighted_adj, degree):
         device = progress_g.device
-        progress_adj = progress_g.adj(scipy_fmt='coo')
-        progress_adj.data = progress_g.edata['weight'].cpu().numpy()
-        ret_adj = sparse.coo_matrix(progress_adj@(
-            weighted_adj/degree.cpu().numpy()))
-        ret_graph = dgl.from_scipy(ret_adj, eweight_name='weight').to(device)
-        ret_graph.edata['weight'] = ret_graph.edata['weight'].float().to(
-            device)
+        progress_adj = progress_g.adj(scipy_fmt="coo")
+        progress_adj.data = progress_g.edata["weight"].cpu().numpy()
+        ret_adj = sparse.coo_matrix(
+            progress_adj @ (weighted_adj / degree.cpu().numpy())
+        )
+        ret_graph = dgl.from_scipy(ret_adj, eweight_name="weight").to(device)
+        ret_graph.edata["weight"] = ret_graph.edata["weight"].float().to(device)
         return ret_graph
 
     def forward(self, g, x):
         feat_list = []
-        if self.dir == 'both':
-            graph_list = self.in_graph_list+self.out_graph_list
-        elif self.dir == 'in':
+        if self.dir == "both":
+            graph_list = self.in_graph_list + self.out_graph_list
+        elif self.dir == "in":
             graph_list = self.in_graph_list
-        elif self.dir == 'out':
+        elif self.dir == "out":
             graph_list = self.out_graph_list
 
         for i in range(self.num_graphs):
             g = graph_list[i]
             with g.local_scope():
-                g.ndata['n'] = self.project_fcs[i](x)
-                g.update_all(fn.u_mul_e('n', 'weight', 'e'),
-                             fn.sum('e', 'feat'))
-                feat_list.append(g.ndata['feat'])
+                g.ndata["n"] = self.project_fcs[i](x)
+                g.update_all(
+                    fn.u_mul_e("n", "weight", "e"), fn.sum("e", "feat")
+                )
+                feat_list.append(g.ndata["feat"])
                 # Each feat has shape [N,q_feats]
         feat_list.append(self.project_fcs[-1](x))
         feat_list = torch.cat(feat_list).view(
-            len(feat_list), -1, self.out_feats)
-        ret = (self.merger*feat_list.permute(1, 2, 0)).permute(2, 0, 1).mean(0)
+            len(feat_list), -1, self.out_feats
+        )
+        ret = (
+            (self.merger * feat_list.permute(1, 2, 0)).permute(2, 0, 1).mean(0)
+        )
         return ret

examples/pytorch/dtgrnn/gaan.py

 import numpy as np
 import torch
 import torch.nn as nn
+
 import dgl
+import dgl.function as fn
 import dgl.nn as dglnn
 from dgl.base import DGLError
-import dgl.function as fn
 from dgl.nn.functional import edge_softmax
 
 
 class WeightedGATConv(dglnn.GATConv):
-    '''
+    """
     This model inherit from dgl GATConv for traffic prediction task,
     it add edge weight when aggregating the node feature.
-    '''
+    """
 
     def forward(self, graph, feat, get_attention=False):
         with graph.local_scope():
             if not self._allow_zero_in_degree:
                 if (graph.in_degrees() == 0).any():
-                    raise DGLError('There are 0-in-degree nodes in the graph, '
-                                   'output for those nodes will be invalid. '
-                                   'This is harmful for some applications, '
-                                   'causing silent performance regression. '
-                                   'Adding self-loop on the input graph by '
-                                   'calling `g = dgl.add_self_loop(g)` will resolve '
-                                   'the issue. Setting ``allow_zero_in_degree`` '
-                                   'to be `True` when constructing this module will '
-                                   'suppress the check and let the code run.')
+                    raise DGLError(
+                        "There are 0-in-degree nodes in the graph, "
+                        "output for those nodes will be invalid. "
+                        "This is harmful for some applications, "
+                        "causing silent performance regression. "
+                        "Adding self-loop on the input graph by "
+                        "calling `g = dgl.add_self_loop(g)` will resolve "
+                        "the issue. Setting ``allow_zero_in_degree`` "
+                        "to be `True` when constructing this module will "
+                        "suppress the check and let the code run."
+                    )
 
             if isinstance(feat, tuple):
                 h_src = self.feat_drop(feat[0])
                 h_dst = self.feat_drop(feat[1])
-                if not hasattr(self, 'fc_src'):
-                    feat_src = self.fc(
-                        h_src).view(-1, self._num_heads, self._out_feats)
-                    feat_dst = self.fc(
-                        h_dst).view(-1, self._num_heads, self._out_feats)
+                if not hasattr(self, "fc_src"):
+                    feat_src = self.fc(h_src).view(
+                        -1, self._num_heads, self._out_feats
+                    )
+                    feat_dst = self.fc(h_dst).view(
+                        -1, self._num_heads, self._out_feats
+                    )
                 else:
-                    feat_src = self.fc_src(
-                        h_src).view(-1, self._num_heads, self._out_feats)
-                    feat_dst = self.fc_dst(
-                        h_dst).view(-1, self._num_heads, self._out_feats)
+                    feat_src = self.fc_src(h_src).view(
+                        -1, self._num_heads, self._out_feats
+                    )
+                    feat_dst = self.fc_dst(h_dst).view(
+                        -1, self._num_heads, self._out_feats
+                    )
             else:
                 h_src = h_dst = self.feat_drop(feat)
                 feat_src = feat_dst = self.fc(h_src).view(
-                    -1, self._num_heads, self._out_feats)
+                    -1, self._num_heads, self._out_feats
+                )
                 if graph.is_block:
-                    feat_dst = feat_src[:graph.number_of_dst_nodes()]
+                    feat_dst = feat_src[: graph.number_of_dst_nodes()]
             # NOTE: GAT paper uses "first concatenation then linear projection"
             # to compute attention scores, while ours is "first projection then
             # addition", the two approaches are mathematically equivalent:
@@ -59,37 +67,38 @@ class WeightedGATConv(dglnn.GATConv):
             # which further speeds up computation and saves memory footprint.
             el = (feat_src * self.attn_l).sum(dim=-1).unsqueeze(-1)
             er = (feat_dst * self.attn_r).sum(dim=-1).unsqueeze(-1)
-            graph.srcdata.update({'ft': feat_src, 'el': el})
-            graph.dstdata.update({'er': er})
+            graph.srcdata.update({"ft": feat_src, "el": el})
+            graph.dstdata.update({"er": er})
             # compute edge attention, el and er are a_l Wh_i and a_r Wh_j respectively.
-            graph.apply_edges(fn.u_add_v('el', 'er', 'e'))
-            e = self.leaky_relu(graph.edata.pop('e'))
+            graph.apply_edges(fn.u_add_v("el", "er", "e"))
+            e = self.leaky_relu(graph.edata.pop("e"))
             # compute softmax
-            graph.edata['a'] = self.attn_drop(edge_softmax(graph, e))
+            graph.edata["a"] = self.attn_drop(edge_softmax(graph, e))
             # compute weighted attention
-            graph.edata['a'] = (graph.edata['a'].permute(
-                1, 2, 0)*graph.edata['weight']).permute(2, 0, 1)
+            graph.edata["a"] = (
+                graph.edata["a"].permute(1, 2, 0) * graph.edata["weight"]
+            ).permute(2, 0, 1)
             # message passing
-            graph.update_all(fn.u_mul_e('ft', 'a', 'm'),
-                             fn.sum('m', 'ft'))
-            rst = graph.dstdata['ft']
+            graph.update_all(fn.u_mul_e("ft", "a", "m"), fn.sum("m", "ft"))
+            rst = graph.dstdata["ft"]
             # residual
             if self.res_fc is not None:
                 resval = self.res_fc(h_dst).view(
-                    h_dst.shape[0], -1, self._out_feats)
+                    h_dst.shape[0], -1, self._out_feats
+                )
                 rst = rst + resval
             # activation
             if self.activation:
                 rst = self.activation(rst)
 
             if get_attention:
-                return rst, graph.edata['a']
+                return rst, graph.edata["a"]
             else:
                 return rst
 
 
 class GatedGAT(nn.Module):
-    '''Gated Graph Attention module, it is a general purpose
+    """Gated Graph Attention module, it is a general purpose
     graph attention module proposed in paper GaAN. The paper use
     it for traffic prediction task
     Parameter
@@ -105,7 +114,7 @@ class GatedGAT(nn.Module):
 
     num_heads : int
         number of head for multihead attention
-    '''
+    """
 
     def __init__(self, in_feats, out_feats, map_feats, num_heads):
         super(GatedGAT, self).__init__()
@@ -113,28 +122,32 @@ class GatedGAT(nn.Module):
         self.out_feats = out_feats
         self.map_feats = map_feats
         self.num_heads = num_heads
-        self.gatlayer = WeightedGATConv(self.in_feats,
-                                        self.out_feats,
-                                        self.num_heads)
+        self.gatlayer = WeightedGATConv(
+            self.in_feats, self.out_feats, self.num_heads
+        )
         self.gate_fn = nn.Linear(
-            2*self.in_feats+self.map_feats, self.num_heads)
+            2 * self.in_feats + self.map_feats, self.num_heads
+        )
         self.gate_m = nn.Linear(self.in_feats, self.map_feats)
         self.merger_layer = nn.Linear(
-            self.in_feats+self.out_feats, self.out_feats)
+            self.in_feats + self.out_feats, self.out_feats
+        )
 
     def forward(self, g, x):
         with g.local_scope():
-            g.ndata['x'] = x
-            g.ndata['z'] = self.gate_m(x)
-            g.update_all(fn.copy_u('x', 'x'), fn.mean('x', 'mean_z'))
-            g.update_all(fn.copy_u('z', 'z'), fn.max('z', 'max_z'))
-            nft = torch.cat([g.ndata['x'], g.ndata['max_z'],
-                             g.ndata['mean_z']], dim=1)
+            g.ndata["x"] = x
+            g.ndata["z"] = self.gate_m(x)
+            g.update_all(fn.copy_u("x", "x"), fn.mean("x", "mean_z"))
+            g.update_all(fn.copy_u("z", "z"), fn.max("z", "max_z"))
+            nft = torch.cat(
+                [g.ndata["x"], g.ndata["max_z"], g.ndata["mean_z"]], dim=1
+            )
             gate = self.gate_fn(nft).sigmoid()
             attn_out = self.gatlayer(g, x)
             node_num = g.num_nodes()
-            gated_out = ((gate.view(-1)*attn_out.view(-1, self.out_feats).T).T).view(
-                node_num, self.num_heads, self.out_feats)
+            gated_out = (
+                (gate.view(-1) * attn_out.view(-1, self.out_feats).T).T
+            ).view(node_num, self.num_heads, self.out_feats)
             gated_out = gated_out.mean(1)
             merge = self.merger_layer(torch.cat([x, gated_out], dim=1))
             return merge

examples/pytorch/dtgrnn/model.py

@@ -2,15 +2,16 @@ import numpy as np
 import scipy.sparse as sparse
 import torch
 import torch.nn as nn
+
 import dgl
+import dgl.function as fn
 import dgl.nn as dglnn
 from dgl.base import DGLError
-import dgl.function as fn
 from dgl.nn.functional import edge_softmax
 
 
 class GraphGRUCell(nn.Module):
-    '''Graph GRU unit which can use any message passing
+    """Graph GRU unit which can use any message passing
     net to replace the linear layer in the original GRU
     Parameter
     ==========
@@ -22,7 +23,7 @@ class GraphGRUCell(nn.Module):
 
     net : torch.nn.Module
         message passing network
-    '''
+    """
 
     def __init__(self, in_feats, out_feats, net):
         super(GraphGRUCell, self).__init__()
@@ -30,28 +31,27 @@ class GraphGRUCell(nn.Module):
         self.out_feats = out_feats
         self.dir = dir
         # net can be any GNN model
-        self.r_net = net(in_feats+out_feats, out_feats)
-        self.u_net = net(in_feats+out_feats, out_feats)
-        self.c_net = net(in_feats+out_feats, out_feats)
+        self.r_net = net(in_feats + out_feats, out_feats)
+        self.u_net = net(in_feats + out_feats, out_feats)
+        self.c_net = net(in_feats + out_feats, out_feats)
         # Manually add bias Bias
         self.r_bias = nn.Parameter(torch.rand(out_feats))
         self.u_bias = nn.Parameter(torch.rand(out_feats))
         self.c_bias = nn.Parameter(torch.rand(out_feats))
 
     def forward(self, g, x, h):
-        r = torch.sigmoid(self.r_net(
-            g, torch.cat([x, h], dim=1)) + self.r_bias)
-        u = torch.sigmoid(self.u_net(
-            g, torch.cat([x, h], dim=1)) + self.u_bias)
-        h_ = r*h
-        c = torch.sigmoid(self.c_net(
-            g, torch.cat([x, h_], dim=1)) + self.c_bias)
-        new_h = u*h + (1-u)*c
+        r = torch.sigmoid(self.r_net(g, torch.cat([x, h], dim=1)) + self.r_bias)
+        u = torch.sigmoid(self.u_net(g, torch.cat([x, h], dim=1)) + self.u_bias)
+        h_ = r * h
+        c = torch.sigmoid(
+            self.c_net(g, torch.cat([x, h_], dim=1)) + self.c_bias
+        )
+        new_h = u * h + (1 - u) * c
         return new_h
 
 
 class StackedEncoder(nn.Module):
-    '''One step encoder unit for hidden representation generation
+    """One step encoder unit for hidden representation generation
     it can stack multiple vertical layers to increase the depth.
 
     Parameter
@@ -67,7 +67,7 @@ class StackedEncoder(nn.Module):
 
     net : torch.nn.Module
         message passing network for graph computation
-    '''
+    """
 
     def __init__(self, in_feats, out_feats, num_layers, net):
         super(StackedEncoder, self).__init__()
@@ -78,11 +78,13 @@ class StackedEncoder(nn.Module):
         self.layers = nn.ModuleList()
         if self.num_layers <= 0:
             raise DGLError("Layer Number must be greater than 0! ")
-        self.layers.append(GraphGRUCell(
-            self.in_feats, self.out_feats, self.net))
-        for _ in range(self.num_layers-1):
-            self.layers.append(GraphGRUCell(
-                self.out_feats, self.out_feats, self.net))
+        self.layers.append(
+            GraphGRUCell(self.in_feats, self.out_feats, self.net)
+        )
+        for _ in range(self.num_layers - 1):
+            self.layers.append(
+                GraphGRUCell(self.out_feats, self.out_feats, self.net)
+            )
 
     # hidden_states should be a list which for different layer
     def forward(self, g, x, hidden_states):
@@ -94,7 +96,7 @@ class StackedEncoder(nn.Module):
 
 
 class StackedDecoder(nn.Module):
-    '''One step decoder unit for hidden representation generation
+    """One step decoder unit for hidden representation generation
     it can stack multiple vertical layers to increase the depth.
 
     Parameter
@@ -113,7 +115,7 @@ class StackedDecoder(nn.Module):
 
     net : torch.nn.Module
         message passing network for graph computation
-    '''
+    """
 
     def __init__(self, in_feats, hid_feats, out_feats, num_layers, net):
         super(StackedDecoder, self).__init__()
@@ -127,9 +129,10 @@ class StackedDecoder(nn.Module):
         if self.num_layers <= 0:
             raise DGLError("Layer Number must be greater than 0!")
         self.layers.append(GraphGRUCell(self.in_feats, self.hid_feats, net))
-        for _ in range(self.num_layers-1):
-            self.layers.append(GraphGRUCell(
-                self.hid_feats, self.hid_feats, net))
+        for _ in range(self.num_layers - 1):
+            self.layers.append(
+                GraphGRUCell(self.hid_feats, self.hid_feats, net)
+            )
 
     def forward(self, g, x, hidden_states):
         hiddens = []
@@ -141,7 +144,7 @@ class StackedDecoder(nn.Module):
 
 
 class GraphRNN(nn.Module):
-    '''Graph Sequence to sequence prediction framework
+    """Graph Sequence to sequence prediction framework
     Support multiple backbone GNN. Mainly used for traffic prediction.
 
     Parameter
@@ -163,15 +166,11 @@ class GraphRNN(nn.Module):
 
     decay_steps : int
         number of steps for the teacher forcing probability to decay
-    '''
-
-    def __init__(self,
-                 in_feats,
-                 out_feats,
-                 seq_len,
-                 num_layers,
-                 net,
-                 decay_steps):
+    """
+
+    def __init__(
+        self, in_feats, out_feats, seq_len, num_layers, net, decay_steps
+    ):
         super(GraphRNN, self).__init__()
         self.in_feats = in_feats
         self.out_feats = out_feats
@@ -180,24 +179,30 @@ class GraphRNN(nn.Module):
         self.net = net
         self.decay_steps = decay_steps
 
-        self.encoder = StackedEncoder(self.in_feats,
-                                      self.out_feats,
-                                      self.num_layers,
-                                      self.net)
+        self.encoder = StackedEncoder(
+            self.in_feats, self.out_feats, self.num_layers, self.net
+        )
+
+        self.decoder = StackedDecoder(
+            self.in_feats,
+            self.out_feats,
+            self.in_feats,
+            self.num_layers,
+            self.net,
+        )
 
-        self.decoder = StackedDecoder(self.in_feats,
-                                      self.out_feats,
-                                      self.in_feats,
-                                      self.num_layers,
-                                      self.net)
     # Threshold For Teacher Forcing
 
     def compute_thresh(self, batch_cnt):
-        return self.decay_steps/(self.decay_steps + np.exp(batch_cnt / self.decay_steps))
+        return self.decay_steps / (
+            self.decay_steps + np.exp(batch_cnt / self.decay_steps)
+        )
 
     def encode(self, g, inputs, device):
-        hidden_states = [torch.zeros(g.num_nodes(), self.out_feats).to(
-            device) for _ in range(self.num_layers)]
+        hidden_states = [
+            torch.zeros(g.num_nodes(), self.out_feats).to(device)
+            for _ in range(self.num_layers)
+        ]
         for i in range(self.seq_len):
             _, hidden_states = self.encoder(g, inputs[i], hidden_states)
 
@@ -207,9 +212,13 @@ class GraphRNN(nn.Module):
         outputs = []
         inputs = torch.zeros(g.num_nodes(), self.in_feats).to(device)
         for i in range(self.seq_len):
-            if np.random.random() < self.compute_thresh(batch_cnt) and self.training:
+            if (
+                np.random.random() < self.compute_thresh(batch_cnt)
+                and self.training
+            ):
                 inputs, hidden_states = self.decoder(
-                    g, teacher_states[i], hidden_states)
+                    g, teacher_states[i], hidden_states
+                )
             else:
                 inputs, hidden_states = self.decoder(g, inputs, hidden_states)
             outputs.append(inputs)

examples/pytorch/dtgrnn/train.py

-from functools import partial
 import argparse
+from functools import partial
+
 import numpy as np
 import torch
 import torch.nn as nn
-from torch.utils.data import DataLoader
-import dgl
-from model import GraphRNN
+from dataloading import (METR_LAGraphDataset, METR_LATestDataset,
+                         METR_LATrainDataset, METR_LAValidDataset,
+                         PEMS_BAYGraphDataset, PEMS_BAYTestDataset,
+                         PEMS_BAYTrainDataset, PEMS_BAYValidDataset)
 from dcrnn import DiffConv
 from gaan import GatedGAT
-from dataloading import METR_LAGraphDataset, METR_LATrainDataset,\
-    METR_LATestDataset, METR_LAValidDataset,\
-    PEMS_BAYGraphDataset, PEMS_BAYTrainDataset,\
-    PEMS_BAYValidDataset, PEMS_BAYTestDataset
-from utils import NormalizationLayer, masked_mae_loss, get_learning_rate
+from model import GraphRNN
+from torch.utils.data import DataLoader
+from utils import NormalizationLayer, get_learning_rate, masked_mae_loss
+
+import dgl
 
 batch_cnt = [0]
 
 
-def train(model, graph, dataloader, optimizer, scheduler, normalizer, loss_fn, device, args):
+def train(
+    model,
+    graph,
+    dataloader,
+    optimizer,
+    scheduler,
+    normalizer,
+    loss_fn,
+    device,
+    args,
+):
     total_loss = []
     graph = graph.to(device)
     model.train()
@@ -27,29 +39,37 @@ def train(model, graph, dataloader, optimizer, scheduler, normalizer, loss_fn, d
         # Padding: Since the diffusion graph is precmputed we need to pad the batch so that
         # each batch have same batch size
         if x.shape[0] != batch_size:
-            x_buff = torch.zeros(
-                batch_size, x.shape[1], x.shape[2], x.shape[3])
-            y_buff = torch.zeros(
-                batch_size, x.shape[1], x.shape[2], x.shape[3])
-            x_buff[:x.shape[0], :, :, :] = x
-            x_buff[x.shape[0]:, :, :,
-                   :] = x[-1].repeat(batch_size-x.shape[0], 1, 1, 1)
-            y_buff[:x.shape[0], :, :, :] = y
-            y_buff[x.shape[0]:, :, :,
-                   :] = y[-1].repeat(batch_size-x.shape[0], 1, 1, 1)
+            x_buff = torch.zeros(batch_size, x.shape[1], x.shape[2], x.shape[3])
+            y_buff = torch.zeros(batch_size, x.shape[1], x.shape[2], x.shape[3])
+            x_buff[: x.shape[0], :, :, :] = x
+            x_buff[x.shape[0] :, :, :, :] = x[-1].repeat(
+                batch_size - x.shape[0], 1, 1, 1
+            )
+            y_buff[: x.shape[0], :, :, :] = y
+            y_buff[x.shape[0] :, :, :, :] = y[-1].repeat(
+                batch_size - x.shape[0], 1, 1, 1
+            )
             x = x_buff
             y = y_buff
         # Permute the dimension for shaping
         x = x.permute(1, 0, 2, 3)
         y = y.permute(1, 0, 2, 3)
 
-        x_norm = normalizer.normalize(x).reshape(
-            x.shape[0], -1, x.shape[3]).float().to(device)
-        y_norm = normalizer.normalize(y).reshape(
-            x.shape[0], -1, x.shape[3]).float().to(device)
+        x_norm = (
+            normalizer.normalize(x)
+            .reshape(x.shape[0], -1, x.shape[3])
+            .float()
+            .to(device)
+        )
+        y_norm = (
+            normalizer.normalize(y)
+            .reshape(x.shape[0], -1, x.shape[3])
+            .float()
+            .to(device)
+        )
         y = y.reshape(y.shape[0], -1, y.shape[3]).float().to(device)
 
-        batch_graph = dgl.batch([graph]*batch_size)
+        batch_graph = dgl.batch([graph] * batch_size)
         output = model(batch_graph, x_norm, y_norm, batch_cnt[0], device)
         # Denormalization for loss compute
         y_pred = normalizer.denormalize(output)
@@ -74,29 +94,37 @@ def eval(model, graph, dataloader, normalizer, loss_fn, device, args):
         # Padding: Since the diffusion graph is precmputed we need to pad the batch so that
         # each batch have same batch size
         if x.shape[0] != batch_size:
-            x_buff = torch.zeros(
-                batch_size, x.shape[1], x.shape[2], x.shape[3])
-            y_buff = torch.zeros(
-                batch_size, x.shape[1], x.shape[2], x.shape[3])
-            x_buff[:x.shape[0], :, :, :] = x
-            x_buff[x.shape[0]:, :, :,
-                   :] = x[-1].repeat(batch_size-x.shape[0], 1, 1, 1)
-            y_buff[:x.shape[0], :, :, :] = y
-            y_buff[x.shape[0]:, :, :,
-                   :] = y[-1].repeat(batch_size-x.shape[0], 1, 1, 1)
+            x_buff = torch.zeros(batch_size, x.shape[1], x.shape[2], x.shape[3])
+            y_buff = torch.zeros(batch_size, x.shape[1], x.shape[2], x.shape[3])
+            x_buff[: x.shape[0], :, :, :] = x
+            x_buff[x.shape[0] :, :, :, :] = x[-1].repeat(
+                batch_size - x.shape[0], 1, 1, 1
+            )
+            y_buff[: x.shape[0], :, :, :] = y
+            y_buff[x.shape[0] :, :, :, :] = y[-1].repeat(
+                batch_size - x.shape[0], 1, 1, 1
+            )
             x = x_buff
             y = y_buff
         # Permute the order of dimension
         x = x.permute(1, 0, 2, 3)
         y = y.permute(1, 0, 2, 3)
 
-        x_norm = normalizer.normalize(x).reshape(
-            x.shape[0], -1, x.shape[3]).float().to(device)
-        y_norm = normalizer.normalize(y).reshape(
-            x.shape[0], -1, x.shape[3]).float().to(device)
+        x_norm = (
+            normalizer.normalize(x)
+            .reshape(x.shape[0], -1, x.shape[3])
+            .float()
+            .to(device)
+        )
+        y_norm = (
+            normalizer.normalize(y)
+            .reshape(x.shape[0], -1, x.shape[3])
+            .float()
+            .to(device)
+        )
         y = y.reshape(x.shape[0], -1, x.shape[3]).to(device)
 
-        batch_graph = dgl.batch([graph]*batch_size)
+        batch_graph = dgl.batch([graph] * batch_size)
         output = model(batch_graph, x_norm, y_norm, i, device)
         y_pred = normalizer.denormalize(output)
         loss = loss_fn(y_pred, y)
@@ -107,70 +135,124 @@ def eval(model, graph, dataloader, normalizer, loss_fn, device, args):
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     # Define the arguments
-    parser.add_argument('--batch_size', type=int, default=64,
-                        help="Size of batch for minibatch Training")
-    parser.add_argument('--num_workers', type=int, default=0,
-                        help="Number of workers for parallel dataloading")
-    parser.add_argument('--model', type=str, default='dcrnn',
-                        help="WHich model to use DCRNN vs GaAN")
-    parser.add_argument('--gpu', type=int, default=-1,
-                        help="GPU indexm -1 for CPU training")
-    parser.add_argument('--diffsteps', type=int, default=2,
-                        help="Step of constructing the diffusiob matrix")
-    parser.add_argument('--num_heads', type=int, default=2,
-                        help="Number of multiattention head")
-    parser.add_argument('--decay_steps', type=int, default=2000,
-                        help="Teacher forcing probability decay ratio")
-    parser.add_argument('--lr', type=float, default=0.01,
-                        help="Initial learning rate")
-    parser.add_argument('--minimum_lr', type=float, default=2e-6,
-                        help="Lower bound of learning rate")
-    parser.add_argument('--dataset', type=str, default='LA',
-                        help="dataset LA for METR_LA; BAY for PEMS_BAY")
-    parser.add_argument('--epochs', type=int, default=100,
-                        help="Number of epoches for training")
-    parser.add_argument('--max_grad_norm', type=float, default=5.0,
-                        help="Maximum gradient norm for update parameters")
+    parser.add_argument(
+        "--batch_size",
+        type=int,
+        default=64,
+        help="Size of batch for minibatch Training",
+    )
+    parser.add_argument(
+        "--num_workers",
+        type=int,
+        default=0,
+        help="Number of workers for parallel dataloading",
+    )
+    parser.add_argument(
+        "--model",
+        type=str,
+        default="dcrnn",
+        help="WHich model to use DCRNN vs GaAN",
+    )
+    parser.add_argument(
+        "--gpu", type=int, default=-1, help="GPU indexm -1 for CPU training"
+    )
+    parser.add_argument(
+        "--diffsteps",
+        type=int,
+        default=2,
+        help="Step of constructing the diffusiob matrix",
+    )
+    parser.add_argument(
+        "--num_heads", type=int, default=2, help="Number of multiattention head"
+    )
+    parser.add_argument(
+        "--decay_steps",
+        type=int,
+        default=2000,
+        help="Teacher forcing probability decay ratio",
+    )
+    parser.add_argument(
+        "--lr", type=float, default=0.01, help="Initial learning rate"
+    )
+    parser.add_argument(
+        "--minimum_lr",
+        type=float,
+        default=2e-6,
+        help="Lower bound of learning rate",
+    )
+    parser.add_argument(
+        "--dataset",
+        type=str,
+        default="LA",
+        help="dataset LA for METR_LA; BAY for PEMS_BAY",
+    )
+    parser.add_argument(
+        "--epochs", type=int, default=100, help="Number of epoches for training"
+    )
+    parser.add_argument(
+        "--max_grad_norm",
+        type=float,
+        default=5.0,
+        help="Maximum gradient norm for update parameters",
+    )
     args = parser.parse_args()
     # Load the datasets
-    if args.dataset == 'LA':
+    if args.dataset == "LA":
         g = METR_LAGraphDataset()
         train_data = METR_LATrainDataset()
         test_data = METR_LATestDataset()
         valid_data = METR_LAValidDataset()
-    elif args.dataset == 'BAY':
+    elif args.dataset == "BAY":
         g = PEMS_BAYGraphDataset()
         train_data = PEMS_BAYTrainDataset()
         test_data = PEMS_BAYTestDataset()
         valid_data = PEMS_BAYValidDataset()
 
     if args.gpu == -1:
-        device = torch.device('cpu')
+        device = torch.device("cpu")
     else:
-        device = torch.device('cuda:{}'.format(args.gpu))
+        device = torch.device("cuda:{}".format(args.gpu))
 
     train_loader = DataLoader(
-        train_data, batch_size=args.batch_size, num_workers=args.num_workers, shuffle=True)
+        train_data,
+        batch_size=args.batch_size,
+        num_workers=args.num_workers,
+        shuffle=True,
+    )
     valid_loader = DataLoader(
-        valid_data, batch_size=args.batch_size, num_workers=args.num_workers, shuffle=True)
+        valid_data,
+        batch_size=args.batch_size,
+        num_workers=args.num_workers,
+        shuffle=True,
+    )
     test_loader = DataLoader(
-        test_data, batch_size=args.batch_size, num_workers=args.num_workers, shuffle=True)
+        test_data,
+        batch_size=args.batch_size,
+        num_workers=args.num_workers,
+        shuffle=True,
+    )
     normalizer = NormalizationLayer(train_data.mean, train_data.std)
 
-    if args.model == 'dcrnn':
-        batch_g = dgl.batch([g]*args.batch_size).to(device)
+    if args.model == "dcrnn":
+        batch_g = dgl.batch([g] * args.batch_size).to(device)
         out_gs, in_gs = DiffConv.attach_graph(batch_g, args.diffsteps)
-        net = partial(DiffConv, k=args.diffsteps,
-                      in_graph_list=in_gs, out_graph_list=out_gs)
-    elif args.model == 'gaan':
+        net = partial(
+            DiffConv,
+            k=args.diffsteps,
+            in_graph_list=in_gs,
+            out_graph_list=out_gs,
+        )
+    elif args.model == "gaan":
         net = partial(GatedGAT, map_feats=64, num_heads=args.num_heads)
 
-    dcrnn = GraphRNN(in_feats=2,
-                     out_feats=64,
-                     seq_len=12,
-                     num_layers=2,
-                     net=net,
-                     decay_steps=args.decay_steps).to(device)
+    dcrnn = GraphRNN(
+        in_feats=2,
+        out_feats=64,
+        seq_len=12,
+        num_layers=2,
+        net=net,
+        decay_steps=args.decay_steps,
+    ).to(device)
 
     optimizer = torch.optim.Adam(dcrnn.parameters(), lr=args.lr)
     scheduler = torch.optim.lr_scheduler.ExponentialLR(optimizer, gamma=0.99)
@@ -178,13 +260,25 @@ if __name__ == "__main__":
     loss_fn = masked_mae_loss
 
     for e in range(args.epochs):
-        train_loss = train(dcrnn, g, train_loader, optimizer, scheduler,
-                           normalizer, loss_fn, device, args)
-        valid_loss = eval(dcrnn, g, valid_loader,
-                          normalizer, loss_fn, device, args)
-        test_loss = eval(dcrnn, g, test_loader,
-                         normalizer, loss_fn, device, args)
-        print("Epoch: {} Train Loss: {} Valid Loss: {} Test Loss: {}".format(e,
-                                                                             train_loss,
-                                                                             valid_loss,
-                                                                             test_loss))
+        train_loss = train(
+            dcrnn,
+            g,
+            train_loader,
+            optimizer,
+            scheduler,
+            normalizer,
+            loss_fn,
+            device,
+            args,
+        )
+        valid_loss = eval(
+            dcrnn, g, valid_loader, normalizer, loss_fn, device, args
+        )
+        test_loss = eval(
+            dcrnn, g, test_loader, normalizer, loss_fn, device, args
+        )
+        print(
+            "Epoch: {} Train Loss: {} Valid Loss: {} Test Loss: {}".format(
+                e, train_loss, valid_loss, test_loss
+            )
+        )

examples/pytorch/dtgrnn/utils.py

-import dgl
-import scipy.sparse as sparse
 import numpy as np
-import torch.nn as nn
+import scipy.sparse as sparse
 import torch
+import torch.nn as nn
+
+import dgl
 
 
 class NormalizationLayer(nn.Module):
@@ -12,10 +13,10 @@ class NormalizationLayer(nn.Module):
 
     # Here we shall expect mean and std be scaler
     def normalize(self, x):
-        return (x-self.mean)/self.std
+        return (x - self.mean) / self.std
 
     def denormalize(self, x):
-        return x*self.std + self.mean
+        return x * self.std + self.mean
 
 
 def masked_mae_loss(y_pred, y_true):
@@ -30,4 +31,4 @@ def masked_mae_loss(y_pred, y_true):
 
 def get_learning_rate(optimizer):
     for param in optimizer.param_groups:
-        return param['lr']
+        return param["lr"]

examples/pytorch/eeg-gcnn/EEGGraphDataset.py

-import torch
-import numpy as np
 import math
+from itertools import product
+
+import numpy as np
 import pandas as pd
+import torch
+
 import dgl
 from dgl.data import DGLDataset
-from itertools import product
 
 
 class EEGGraphDataset(DGLDataset):
-    """ Build graph, treat all nodes as the same type
-        Parameters
-        ----------
-        x: edge weights of 8-node complete graph
-            There are 1 x 64 edges
-        y: labels (diseased/healthy)
-        num_nodes: the number of nodes of the graph. In our case, it is 8.
-        indices: Patient level indices. They are used to generate edge weights.
-
-        Output
-        ------
-        a complete 8-node DGLGraph with node features and edge weights
+    """Build graph, treat all nodes as the same type
+    Parameters
+    ----------
+    x: edge weights of 8-node complete graph
+        There are 1 x 64 edges
+    y: labels (diseased/healthy)
+    num_nodes: the number of nodes of the graph. In our case, it is 8.
+    indices: Patient level indices. They are used to generate edge weights.
+
+    Output
+    ------
+    a complete 8-node DGLGraph with node features and edge weights
     """
+
     def __init__(self, x, y, num_nodes, indices):
         # CAUTION - x and labels are memory-mapped, used as if they are in RAM.
         self.x = x
@@ -37,27 +40,24 @@ class EEGGraphDataset(DGLDataset):
             "P7-P3",
             "P8-P4",
             "O1-P3",
-            "O2-P4"
+            "O2-P4",
         ]
 
         # in the 10-10 system, in between the 2 10-20 electrodes in ch_names, used for calculating edge weights
         # Note: "01" is for "P03", and "02" is for "P04."
-        self.ref_names = [
-            "F5",
-            "F6",
-            "C5",
-            "C6",
-            "P5",
-            "P6",
-            "O1",
-            "O2"
-        ]
+        self.ref_names = ["F5", "F6", "C5", "C6", "P5", "P6", "O1", "O2"]
 
         # edge indices source to target - 2 x E = 2 x 64
         # fully connected undirected graph so 8*8=64 edges
         self.node_ids = range(len(self.ch_names))
-        self.edge_index = torch.tensor([[a, b] for a, b in product(self.node_ids, self.node_ids)],
-                                       dtype=torch.long).t().contiguous()
+        self.edge_index = (
+            torch.tensor(
+                [[a, b] for a, b in product(self.node_ids, self.node_ids)],
+                dtype=torch.long,
+            )
+            .t()
+            .contiguous()
+        )
 
         # edge attributes - E x 1
         # only the spatial distance between electrodes for now - standardize between 0 and 1
@@ -68,18 +68,22 @@ class EEGGraphDataset(DGLDataset):
 
     # sensor distances don't depend on window ID
     def get_sensor_distances(self):
-        coords_1010 = pd.read_csv("standard_1010.tsv.txt", sep='\t')
+        coords_1010 = pd.read_csv("standard_1010.tsv.txt", sep="\t")
         num_edges = self.edge_index.shape[1]
         distances = []
         for edge_idx in range(num_edges):
             sensor1_idx = self.edge_index[0, edge_idx]
             sensor2_idx = self.edge_index[1, edge_idx]
-            dist = self.get_geodesic_distance(sensor1_idx, sensor2_idx, coords_1010)
+            dist = self.get_geodesic_distance(
+                sensor1_idx, sensor2_idx, coords_1010
+            )
             distances.append(dist)
         assert len(distances) == num_edges
         return distances
 
-    def get_geodesic_distance(self, montage_sensor1_idx, montage_sensor2_idx, coords_1010):
+    def get_geodesic_distance(
+        self, montage_sensor1_idx, montage_sensor2_idx, coords_1010
+    ):
 
         # get the reference sensor in the 10-10 system for the current montage pair in 10-20 system
         ref_sensor1 = self.ref_names[montage_sensor1_idx]
@@ -96,7 +100,9 @@ class EEGGraphDataset(DGLDataset):
         # https://math.stackexchange.com/questions/1304169/distance-between-two-points-on-a-sphere
         r = 1  # since coords are on unit sphere
         # rounding is for numerical stability, domain is [-1, 1]
-        dist = r * math.acos(round(((x1 * x2) + (y1 * y2) + (z1 * z2)) / (r ** 2), 2))
+        dist = r * math.acos(
+            round(((x1 * x2) + (y1 * y2) + (z1 * z2)) / (r**2), 2)
+        )
         return dist
 
     # returns size of dataset = number of indices
@@ -123,19 +129,23 @@ class EEGGraphDataset(DGLDataset):
         edge_weights = torch.tensor(edge_weights)  # trucated to integer
 
         # create 8-node complete graph
-        src = [[0 for i in range(self.num_nodes)] for j in range(self.num_nodes)]
+        src = [
+            [0 for i in range(self.num_nodes)] for j in range(self.num_nodes)
+        ]
         for i in range(len(src)):
             for j in range(len(src[i])):
                 src[i][j] = i
         src = np.array(src).flatten()
 
-        det = [[i for i in range(self.num_nodes)] for j in range(self.num_nodes)]
+        det = [
+            [i for i in range(self.num_nodes)] for j in range(self.num_nodes)
+        ]
         det = np.array(det).flatten()
 
         u, v = (torch.tensor(src), torch.tensor(det))
         g = dgl.graph((u, v))
 
         # add node features and edge features
-        g.ndata['x'] = node_features
-        g.edata['edge_weights'] = edge_weights
+        g.ndata["x"] = node_features
+        g.edata["edge_weights"] = edge_weights
         return g, torch.tensor(idx), torch.tensor(self.labels[idx])

examples/pytorch/eeg-gcnn/deep_EEGGraphConvNet.py

 import torch.nn as nn
 import torch.nn.functional as function
-from dgl.nn import GraphConv, SumPooling
 from torch.nn import BatchNorm1d
 
+from dgl.nn import GraphConv, SumPooling
+
 
 class EEGGraphConvNet(nn.Module):
-    """ EEGGraph Convolution Net
-        Parameters
-        ----------
-        num_feats: the number of features per node. In our case, it is 6.
+    """EEGGraph Convolution Net
+    Parameters
+    ----------
+    num_feats: the number of features per node. In our case, it is 6.
     """
+
     def __init__(self, num_feats):
         super(EEGGraphConvNet, self).__init__()
 
@@ -17,7 +19,9 @@ class EEGGraphConvNet(nn.Module):
         self.conv2 = GraphConv(16, 32)
         self.conv3 = GraphConv(32, 64)
         self.conv4 = GraphConv(64, 50)
-        self.conv4_bn = BatchNorm1d(50, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
+        self.conv4_bn = BatchNorm1d(
+            50, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True
+        )
 
         self.fc_block1 = nn.Linear(50, 30)
         self.fc_block2 = nn.Linear(30, 10)
@@ -31,8 +35,8 @@ class EEGGraphConvNet(nn.Module):
         self.sumpool = SumPooling()
 
     def forward(self, g, return_graph_embedding=False):
-        x = g.ndata['x']
-        edge_weight = g.edata['edge_weights']
+        x = g.ndata["x"]
+        edge_weight = g.edata["edge_weights"]
 
         x = self.conv1(g, x, edge_weight=edge_weight)
         x = function.leaky_relu(x, negative_slope=0.01)

examples/pytorch/eeg-gcnn/main.py

 import argparse
+
 import numpy as np
 import pandas as pd
 import torch
 import torch.nn as nn
-from sklearn.model_selection import train_test_split
-from joblib import load
 from EEGGraphDataset import EEGGraphDataset
-from dgl.dataloading import GraphDataLoader
-from torch.utils.data import WeightedRandomSampler
-from sklearn.metrics import roc_auc_score
-from sklearn.metrics import balanced_accuracy_score
+from joblib import load
 from sklearn import preprocessing
+from sklearn.metrics import balanced_accuracy_score, roc_auc_score
+from sklearn.model_selection import train_test_split
+from torch.utils.data import WeightedRandomSampler
 
+from dgl.dataloading import GraphDataLoader
 
 if __name__ == "__main__":
     # argparse commandline args
-    parser = argparse.ArgumentParser(description='Execute training pipeline on a given train/val subjects')
-    parser.add_argument('--num_feats', type=int, default=6, help='Number of features per node for the graph')
-    parser.add_argument('--num_nodes', type=int, default=8, help='Number of nodes in the graph')
-    parser.add_argument('--gpu_idx', type=int, default=0,
-                        help='index of GPU device that should be used for this run, defaults to 0.')
-    parser.add_argument('--num_epochs', type=int, default=40, help='Number of epochs used to train')
-    parser.add_argument('--exp_name', type=str, default='default', help='Name for the test.')
-    parser.add_argument('--batch_size', type=int, default=512, help='Batch Size. Default is 512.')
-    parser.add_argument('--model', type=str, default='shallow',
-                        help='type shallow to use shallow_EEGGraphDataset; '
-                             'type deep to use deep_EEGGraphDataset. Default is shallow')
+    parser = argparse.ArgumentParser(
+        description="Execute training pipeline on a given train/val subjects"
+    )
+    parser.add_argument(
+        "--num_feats",
+        type=int,
+        default=6,
+        help="Number of features per node for the graph",
+    )
+    parser.add_argument(
+        "--num_nodes", type=int, default=8, help="Number of nodes in the graph"
+    )
+    parser.add_argument(
+        "--gpu_idx",
+        type=int,
+        default=0,
+        help="index of GPU device that should be used for this run, defaults to 0.",
+    )
+    parser.add_argument(
+        "--num_epochs",
+        type=int,
+        default=40,
+        help="Number of epochs used to train",
+    )
+    parser.add_argument(
+        "--exp_name", type=str, default="default", help="Name for the test."
+    )
+    parser.add_argument(
+        "--batch_size",
+        type=int,
+        default=512,
+        help="Batch Size. Default is 512.",
+    )
+    parser.add_argument(
+        "--model",
+        type=str,
+        default="shallow",
+        help="type shallow to use shallow_EEGGraphDataset; "
+        "type deep to use deep_EEGGraphDataset. Default is shallow",
+    )
     args = parser.parse_args()
 
     # choose model
-    if args.model == 'shallow':
+    if args.model == "shallow":
         from shallow_EEGGraphConvNet import EEGGraphConvNet
 
-    if args.model == 'deep':
+    if args.model == "deep":
         from deep_EEGGraphConvNet import EEGGraphConvNet
 
     # set the random seed so that we can reproduce the results
@@ -41,9 +70,11 @@ if __name__ == "__main__":
 
     # use GPU when available
     _GPU_IDX = args.gpu_idx
-    _DEVICE = torch.device(f'cuda:{_GPU_IDX}' if torch.cuda.is_available() else 'cpu')
+    _DEVICE = torch.device(
+        f"cuda:{_GPU_IDX}" if torch.cuda.is_available() else "cpu"
+    )
     torch.cuda.set_device(_DEVICE)
-    print(f' Using device: {_DEVICE} {torch.cuda.get_device_name(_DEVICE)}')
+    print(f" Using device: {_DEVICE} {torch.cuda.get_device_name(_DEVICE)}")
 
     # load patient level indices
     _DATASET_INDEX = pd.read_csv("master_metadata_index.csv")
@@ -58,10 +89,10 @@ if __name__ == "__main__":
     num_feats = args.num_feats
 
     # set up input and targets from files
-    memmap_x = f'psd_features_data_X'
-    memmap_y = f'labels_y'
-    x = load(memmap_x, mmap_mode='r')
-    y = load(memmap_y, mmap_mode='r')
+    memmap_x = f"psd_features_data_X"
+    memmap_y = f"labels_y"
+    x = load(memmap_x, mmap_mode="r")
+    y = load(memmap_y, mmap_mode="r")
 
     # normalize psd features data
     normd_x = []
@@ -79,22 +110,33 @@ if __name__ == "__main__":
     print(f"Unique labels 0/1 mapping: {label_mapping}")
 
     # split the dataset to train and test. The ratio of test is 0.3.
-    train_and_val_subjects, heldout_subjects = train_test_split(all_subjects, test_size=0.3, random_state=42)
+    train_and_val_subjects, heldout_subjects = train_test_split(
+        all_subjects, test_size=0.3, random_state=42
+    )
 
     # split the dataset using patient indices
     train_window_indices = _DATASET_INDEX.index[
-        _DATASET_INDEX["patient_ID"].astype("str").isin(train_and_val_subjects)].tolist()
+        _DATASET_INDEX["patient_ID"].astype("str").isin(train_and_val_subjects)
+    ].tolist()
     heldout_test_window_indices = _DATASET_INDEX.index[
-        _DATASET_INDEX["patient_ID"].astype("str").isin(heldout_subjects)].tolist()
+        _DATASET_INDEX["patient_ID"].astype("str").isin(heldout_subjects)
+    ].tolist()
 
     # define model, optimizer, scheduler
     model = EEGGraphConvNet(num_feats)
     loss_function = nn.CrossEntropyLoss()
     optimizer = torch.optim.SGD(model.parameters(), lr=0.01)
-    scheduler = torch.optim.lr_scheduler.MultiStepLR(optimizer, milestones=[i * 10 for i in range(1, 26)], gamma=0.1)
+    scheduler = torch.optim.lr_scheduler.MultiStepLR(
+        optimizer, milestones=[i * 10 for i in range(1, 26)], gamma=0.1
+    )
 
     model = model.to(_DEVICE).double()
-    num_trainable_params = np.sum([np.prod(p.size()) if p.requires_grad else 0 for p in model.parameters()])
+    num_trainable_params = np.sum(
+        [
+            np.prod(p.size()) if p.requires_grad else 0
+            for p in model.parameters()
+        ]
+    )
 
     # Dataloader========================================================================================================
 
@@ -109,7 +151,8 @@ if __name__ == "__main__":
     # sampler needs to come up with training set size number of samples
     weighted_sampler = WeightedRandomSampler(
         weights=sample_weights,
-        num_samples=len(train_window_indices), replacement=True
+        num_samples=len(train_window_indices),
+        replacement=True,
     )
 
     # train data loader
@@ -118,17 +161,20 @@ if __name__ == "__main__":
     )
 
     train_loader = GraphDataLoader(
-        dataset=train_dataset, batch_size=_BATCH_SIZE,
+        dataset=train_dataset,
+        batch_size=_BATCH_SIZE,
         sampler=weighted_sampler,
         num_workers=NUM_WORKERS,
-        pin_memory=True
+        pin_memory=True,
     )
 
     # this loader is used without weighted sampling, to evaluate metrics on full training set after each epoch
     train_metrics_loader = GraphDataLoader(
-        dataset=train_dataset, batch_size=_BATCH_SIZE,
-        shuffle=False, num_workers=NUM_WORKERS,
-        pin_memory=True
+        dataset=train_dataset,
+        batch_size=_BATCH_SIZE,
+        shuffle=False,
+        num_workers=NUM_WORKERS,
+        pin_memory=True,
     )
 
     # test data loader
@@ -137,9 +183,11 @@ if __name__ == "__main__":
     )
 
     test_loader = GraphDataLoader(
-        dataset=test_dataset, batch_size=_BATCH_SIZE,
-        shuffle=False, num_workers=NUM_WORKERS,
-        pin_memory=True
+        dataset=test_dataset,
+        batch_size=_BATCH_SIZE,
+        shuffle=False,
+        num_workers=NUM_WORKERS,
+        pin_memory=True,
     )
 
     auroc_train_history = []
@@ -173,7 +221,7 @@ if __name__ == "__main__":
         # update learning rate
         scheduler.step()
 
-    # evaluate model after each epoch for train-metric data============================================================
+        # evaluate model after each epoch for train-metric data============================================================
         model.eval()
         with torch.no_grad():
             y_probs_train = torch.empty(0, 2).to(_DEVICE)
@@ -194,10 +242,12 @@ if __name__ == "__main__":
                 y_true_train += y_batch.cpu().numpy().tolist()
 
         # returning prob distribution over target classes, take softmax over the 1st dimension
-        y_probs_train = nn.functional.softmax(y_probs_train, dim=1).cpu().numpy()
+        y_probs_train = (
+            nn.functional.softmax(y_probs_train, dim=1).cpu().numpy()
+        )
         y_true_train = np.array(y_true_train)
 
-    # evaluate model after each epoch for validation data ==============================================================
+        # evaluate model after each epoch for validation data ==============================================================
         y_probs_test = torch.empty(0, 2).to(_DEVICE)
         y_true_test, minibatch_loss, y_pred_test = [], [], []
 
@@ -217,32 +267,54 @@ if __name__ == "__main__":
             y_true_test += y_batch.cpu().numpy().tolist()
 
         # returning prob distribution over target classes, take softmax over the 1st dimension
-        y_probs_test = torch.nn.functional.softmax(y_probs_test, dim=1).cpu().numpy()
+        y_probs_test = (
+            torch.nn.functional.softmax(y_probs_test, dim=1).cpu().numpy()
+        )
         y_true_test = np.array(y_true_test)
 
         # record training auroc and testing auroc
-        auroc_train_history.append(roc_auc_score(y_true_train, y_probs_train[:, 1]))
-        auroc_test_history.append(roc_auc_score(y_true_test, y_probs_test[:, 1]))
+        auroc_train_history.append(
+            roc_auc_score(y_true_train, y_probs_train[:, 1])
+        )
+        auroc_test_history.append(
+            roc_auc_score(y_true_test, y_probs_test[:, 1])
+        )
 
         # record training balanced accuracy and testing balanced accuracy
-        balACC_train_history.append(balanced_accuracy_score(y_true_train, y_pred_train))
-        balACC_test_history.append(balanced_accuracy_score(y_true_test, y_pred_test))
+        balACC_train_history.append(
+            balanced_accuracy_score(y_true_train, y_pred_train)
+        )
+        balACC_test_history.append(
+            balanced_accuracy_score(y_true_test, y_pred_test)
+        )
 
         # LOSS - epoch loss is defined as mean of minibatch losses within epoch
         loss_train_history.append(np.mean(train_loss))
         loss_test_history.append(np.mean(minibatch_loss))
 
         # print the metrics
-        print("Train loss: {}, test loss: {}".format(loss_train_history[-1], loss_test_history[-1]))
-        print("Train AUC: {}, test AUC: {}".format(auroc_train_history[-1], auroc_test_history[-1]))
-        print("Train Bal.ACC: {}, test Bal.ACC: {}".format(balACC_train_history[-1], balACC_test_history[-1]))
+        print(
+            "Train loss: {}, test loss: {}".format(
+                loss_train_history[-1], loss_test_history[-1]
+            )
+        )
+        print(
+            "Train AUC: {}, test AUC: {}".format(
+                auroc_train_history[-1], auroc_test_history[-1]
+            )
+        )
+        print(
+            "Train Bal.ACC: {}, test Bal.ACC: {}".format(
+                balACC_train_history[-1], balACC_test_history[-1]
+            )
+        )
 
         # save model from each epoch====================================================================================
         state = {
-            'epochs': _NUM_EPOCHS,
-            'experiment_name': _EXPERIMENT_NAME,
-            'model_description': str(model),
-            'state_dict': model.state_dict(),
-            'optimizer': optimizer.state_dict()
+            "epochs": _NUM_EPOCHS,
+            "experiment_name": _EXPERIMENT_NAME,
+            "model_description": str(model),
+            "state_dict": model.state_dict(),
+            "optimizer": optimizer.state_dict(),
         }
         torch.save(state, f"{_EXPERIMENT_NAME}_Epoch_{epoch}.ckpt")

examples/pytorch/eeg-gcnn/shallow_EEGGraphConvNet.py

 import torch.nn as nn
 import torch.nn.functional as function
+
 from dgl.nn import GraphConv, SumPooling
 
 
 class EEGGraphConvNet(nn.Module):
-    """ EEGGraph Convolution Net
-        Parameters
-        ----------
-        num_feats: the number of features per node. In our case, it is 6.
+    """EEGGraph Convolution Net
+    Parameters
+    ----------
+    num_feats: the number of features per node. In our case, it is 6.
     """
+
     def __init__(self, num_feats):
         super(EEGGraphConvNet, self).__init__()
 
         self.conv1 = GraphConv(num_feats, 32)
         self.conv2 = GraphConv(32, 20)
-        self.conv2_bn = nn.BatchNorm1d(20, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
+        self.conv2_bn = nn.BatchNorm1d(
+            20, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True
+        )
         self.fc_block1 = nn.Linear(20, 10)
         self.fc_block2 = nn.Linear(10, 2)
 
@@ -23,11 +27,13 @@ class EEGGraphConvNet(nn.Module):
         self.fc_block2.apply(lambda x: nn.init.xavier_normal_(x.weight, gain=1))
 
     def forward(self, g, return_graph_embedding=False):
-        x = g.ndata['x']
-        edge_weight = g.edata['edge_weights']
+        x = g.ndata["x"]
+        edge_weight = g.edata["edge_weights"]
 
         x = function.leaky_relu(self.conv1(g, x, edge_weight=edge_weight))
-        x = function.leaky_relu(self.conv2_bn(self.conv2(g, x, edge_weight=edge_weight)))
+        x = function.leaky_relu(
+            self.conv2_bn(self.conv2(g, x, edge_weight=edge_weight))
+        )
 
         # NOTE: this takes node-level features/"embeddings"
         # and aggregates to graph-level - use for graph-level classification

examples/pytorch/eges/main.py

-import dgl
 import torch as th
 import torch.optim as optim
-from torch.utils.data import DataLoader
-from sklearn import metrics
-
 import utils
 from model import EGES
 from sampler import Sampler
+from sklearn import metrics
+from torch.utils.data import DataLoader
+
+import dgl
 
 
 def train(args, train_g, sku_info, num_skus, num_brands, num_shops, num_cates):
     sampler = Sampler(
-        train_g, 
-        args.walk_length, 
-        args.num_walks, 
-        args.window_size, 
-        args.num_negative
+        train_g,
+        args.walk_length,
+        args.num_walks,
+        args.window_size,
+        args.num_negative,
     )
     # for each node in the graph, we sample pos and neg
     # pairs for it, and feed these sampled pairs into the model.
@@ -25,7 +25,7 @@ def train(args, train_g, sku_info, num_skus, num_brands, num_shops, num_cates):
         # this is the batch_size of input nodes
         batch_size=args.batch_size,
         shuffle=True,
-        collate_fn=lambda x: sampler.sample(x, sku_info)
+        collate_fn=lambda x: sampler.sample(x, sku_info),
     )
     model = EGES(args.dim, num_skus, num_brands, num_shops, num_cates)
     optimizer = optim.Adam(model.parameters(), lr=args.lr)
@@ -45,8 +45,11 @@ def train(args, train_g, sku_info, num_skus, num_brands, num_shops, num_cates):
             epoch_total_loss += loss.item()
 
             if step % args.log_every == 0:
-                print('Epoch {:05d} | Step {:05d} | Step Loss {:.4f} | Epoch Avg Loss: {:.4f}'.format(
-                            epoch, step, loss.item(), epoch_total_loss / (step + 1)))
+                print(
+                    "Epoch {:05d} | Step {:05d} | Step Loss {:.4f} | Epoch Avg Loss: {:.4f}".format(
+                        epoch, step, loss.item(), epoch_total_loss / (step + 1)
+                    )
+                )
 
         eval(model, test_g, sku_info)
 
@@ -77,15 +80,14 @@ if __name__ == "__main__":
     valid_sku_raw_ids = utils.get_valid_sku_set(args.item_info_data)
 
     g, sku_encoder, sku_decoder = utils.construct_graph(
-        args.action_data, 
-        args.session_interval_sec,
-        valid_sku_raw_ids
+        args.action_data, args.session_interval_sec, valid_sku_raw_ids
     )
 
     train_g, test_g = utils.split_train_test_graph(g)
 
-    sku_info_encoder, sku_info_decoder, sku_info = \
-        utils.encode_sku_fields(args.item_info_data, sku_encoder, sku_decoder)
+    sku_info_encoder, sku_info_decoder, sku_info = utils.encode_sku_fields(
+        args.item_info_data, sku_encoder, sku_decoder
+    )
 
     num_skus = len(sku_encoder)
     num_brands = len(sku_info_encoder["brand"])
@@ -93,8 +95,11 @@ if __name__ == "__main__":
     num_cates = len(sku_info_encoder["cate"])
 
     print(
-        "Num skus: {}, num brands: {}, num shops: {}, num cates: {}".\
-            format(num_skus, num_brands, num_shops, num_cates)
+        "Num skus: {}, num brands: {}, num shops: {}, num cates: {}".format(
+            num_skus, num_brands, num_shops, num_cates
+        )
     )
 
-    model = train(args, train_g, sku_info, num_skus, num_brands, num_shops, num_cates)
+    model = train(
+        args, train_g, sku_info, num_skus, num_brands, num_shops, num_cates
+    )

examples/pytorch/eges/model.py

@@ -18,12 +18,12 @@ class EGES(th.nn.Module):
         # srcs: sku_id, brand_id, shop_id, cate_id
         srcs = self.query_node_embed(srcs)
         dsts = self.query_node_embed(dsts)
-        
+
         return srcs, dsts
-    
+
     def query_node_embed(self, nodes):
         """
-            @nodes: tensor of shape (batch_size, num_side_info)
+        @nodes: tensor of shape (batch_size, num_side_info)
         """
         batch_size = nodes.shape[0]
         # query side info weights, (batch_size, 4)
@@ -33,21 +33,31 @@ class EGES(th.nn.Module):
         side_info_weights_sum = []
         for i in range(4):
             # weights for i-th side info, (batch_size, ) -> (batch_size, 1)
-            i_th_side_info_weights = side_info_weights[:, i].view((batch_size, 1))
+            i_th_side_info_weights = side_info_weights[:, i].view(
+                (batch_size, 1)
+            )
             # batch of i-th side info embedding * its weight, (batch_size, dim)
-            side_info_weighted_embeds_sum.append(i_th_side_info_weights * self.embeds[i](nodes[:, i]))
+            side_info_weighted_embeds_sum.append(
+                i_th_side_info_weights * self.embeds[i](nodes[:, i])
+            )
             side_info_weights_sum.append(i_th_side_info_weights)
         # stack: (batch_size, 4, dim), sum: (batch_size, dim)
-        side_info_weighted_embeds_sum = th.sum(th.stack(side_info_weighted_embeds_sum, axis=1), axis=1)
+        side_info_weighted_embeds_sum = th.sum(
+            th.stack(side_info_weighted_embeds_sum, axis=1), axis=1
+        )
         # stack: (batch_size, 4), sum: (batch_size, )
-        side_info_weights_sum = th.sum(th.stack(side_info_weights_sum, axis=1), axis=1)
+        side_info_weights_sum = th.sum(
+            th.stack(side_info_weights_sum, axis=1), axis=1
+        )
         # (batch_size, dim)
         H = side_info_weighted_embeds_sum / side_info_weights_sum
 
-        return H       
+        return H
 
     def loss(self, srcs, dsts, labels):
         dots = th.sigmoid(th.sum(srcs * dsts, axis=1))
         dots = th.clamp(dots, min=1e-7, max=1 - 1e-7)
 
-        return th.mean(- (labels * th.log(dots) + (1 - labels) * th.log(1 - dots)))
+        return th.mean(
+            -(labels * th.log(dots) + (1 - labels) * th.log(1 - dots))
+        )