add ConcaTable, JoinTable, Identity functions

spconv/__init__.py

 # Copyright 2019 Yan Yan
-# 
+#
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
-# 
+#
 #     http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -23,6 +23,8 @@ from spconv.conv import SparseConvTranspose2d, SparseConvTranspose3d
 from spconv.conv import SparseInverseConv2d, SparseInverseConv3d
 from spconv.modules import SparseModule, SparseSequential
 from spconv.pool import SparseMaxPool2d, SparseMaxPool3d
+from spconv.tables import ConcatTable, JoinTable
+from spconv.identity import Identity
 
 from spconv import ops
 
@@ -55,7 +57,7 @@ class SparseConvTensor(object):
                 is very large.
         """
         self.features = features
-        self.indices = indices 
+        self.indices = indices
         if self.indices.dtype != torch.int32:
             self.indices.int()
         self.spatial_shape = spatial_shape
@@ -69,7 +71,7 @@ class SparseConvTensor(object):
 
     def find_indice_pair(self, key):
         if key is None:
-            return None 
+            return None
         if key in self.indice_dict:
             return self.indice_dict[key]
         return None
@@ -100,4 +102,4 @@ class RemoveGrid(SparseModule):
     """
     def forward(self, x: SparseConvTensor):
         x.grid = None
-        return x
+        return x
\ No newline at end of file

spconv/identity.py

+# Copyright 2016-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the
+# LICENSE file in the root directory of this source tree.
+
+from torch.nn import Module
+
+
+class Identity(Module):
+    def forward(self, input):
+        return input
+
+    def input_spatial_size(self, out_size):
+        return out_size

spconv/tables.py

+
+from torch.autograd import Function
+#from torch.nn import Module
+from spconv.modules import SparseModule
+import spconv
+import torch
+
+class JoinTable(SparseModule):# Module):
+    def forward(self, input):
+        output = spconv.SparseConvTensor(
+                torch.cat([i.features for i in input],1), input[1].indices,
+                input[1].spatial_shape, input[0].batch_size )
+        output.indice_dict = input[1].indice_dict
+        output.grid = input[1].grid
+        return output
+
+    def input_spatial_size(self, out_size):
+        return out_size
+
+
+class AddTable(SparseModule): # Module):
+    def forward(self, input):
+        output = spconv.SparseConvTensor(
+                sum([i.features for i in input]), input[1].indices,
+                input[1].spatial_shape, input[1].batch_size )
+        output.indice_dict = input[1].indice_dict
+        output.grid = input[1].grid
+
+        return output
+
+    def input_spatial_size(self, out_size):
+        return out_size
+
+
+class ConcatTable(SparseModule): # Module):
+    def forward(self, input):
+        return [module(input) for module in self._modules.values()]
+
+    def add(self, module):
+        self._modules[str(len(self._modules))] = module
+        return self
+
+    def input_spatial_size(self, out_size):
+        return self._modules['0'].input_spatial_size(out_size)