add tests for upsample blocks

src/diffusers/models/resnet.py

-
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
@@ -29,6 +28,7 @@ def conv_nd(dims, *args, **kwargs):
         return nn.Conv3d(*args, **kwargs)
     raise ValueError(f"unsupported dimensions: {dims}")
 
+
 def conv_transpose_nd(dims, *args, **kwargs):
     """
     Create a 1D, 2D, or 3D convolution module.
@@ -73,7 +73,7 @@ class Upsample(nn.Module):
         self.use_conv_transpose = use_conv_transpose
 
         if use_conv_transpose:
-            self.conv = conv_transpose_nd(dims, channels, out_channels, 4, 2, 1)
+            self.conv = conv_transpose_nd(dims, channels, self.out_channels, 4, 2, 1)
         elif use_conv:
             self.conv = conv_nd(dims, self.channels, self.out_channels, 3, padding=1)
 
@@ -81,15 +81,15 @@ class Upsample(nn.Module):
         assert x.shape[1] == self.channels
         if self.use_conv_transpose:
             return self.conv(x)
-        
+
         if self.dims == 3:
             x = F.interpolate(x, (x.shape[2], x.shape[3] * 2, x.shape[4] * 2), mode="nearest")
         else:
             x = F.interpolate(x, scale_factor=2.0, mode="nearest")
-        
+
         if self.use_conv:
             x = self.conv(x)
-        
+
         return x
 
 
@@ -138,6 +138,7 @@ class UNetUpsample(nn.Module):
             x = self.conv(x)
         return x
 
+
 class GlideUpsample(nn.Module):
     """
     An upsampling layer with an optional convolution.
@@ -199,13 +200,14 @@ class LDMUpsample(nn.Module):
 
 class GradTTSUpsample(torch.nn.Module):
     def __init__(self, dim):
-        super(Upsample, self).__init__()
+        super(GradTTSUpsample, self).__init__()
         self.conv = torch.nn.ConvTranspose2d(dim, dim, 4, 2, 1)
 
     def forward(self, x):
         return self.conv(x)
 
 
+# TODO (patil-suraj): needs test
 class Upsample1d(nn.Module):
     def __init__(self, dim):
         super().__init__()

tests/test_layers_utils.py

@@ -22,6 +22,7 @@ import numpy as np
 import torch
 
 from diffusers.models.embeddings import get_timestep_embedding
+from diffusers.models.resnet import Upsample
 from diffusers.testing_utils import floats_tensor, slow, torch_device
 
 
@@ -113,3 +114,53 @@ class EmbeddingsTests(unittest.TestCase):
             torch.tensor([-0.9801, -0.9464, -0.9349, -0.3952, 0.8887, -0.9709, 0.5299, -0.2853, -0.9927]),
             1e-3,
         )
+
+
+class UpsampleBlockTests(unittest.TestCase):
+    def test_upsample_default(self):
+        torch.manual_seed(0)
+        sample = torch.randn(1, 32, 32, 32)
+        upsample = Upsample(channels=32, use_conv=False)
+        with torch.no_grad():
+            upsampled = upsample(sample)
+
+        assert upsampled.shape == (1, 32, 64, 64)
+        output_slice = upsampled[0, -1, -3:, -3:]
+        expected_slice = torch.tensor([-0.2173, -1.2079, -1.2079, 0.2952, 1.1254, 1.1254, 0.2952, 1.1254, 1.1254])
+        assert torch.allclose(output_slice.flatten(), expected_slice, atol=1e-3)
+
+    def test_upsample_with_conv(self):
+        torch.manual_seed(0)
+        sample = torch.randn(1, 32, 32, 32)
+        upsample = Upsample(channels=32, use_conv=True)
+        with torch.no_grad():
+            upsampled = upsample(sample)
+
+        assert upsampled.shape == (1, 32, 64, 64)
+        output_slice = upsampled[0, -1, -3:, -3:]
+        expected_slice = torch.tensor([0.7145, 1.3773, 0.3492, 0.8448, 1.0839, -0.3341, 0.5956, 0.1250, -0.4841])
+        assert torch.allclose(output_slice.flatten(), expected_slice, atol=1e-3)
+
+    def test_upsample_with_conv_out_dim(self):
+        torch.manual_seed(0)
+        sample = torch.randn(1, 32, 32, 32)
+        upsample = Upsample(channels=32, use_conv=True, out_channels=64)
+        with torch.no_grad():
+            upsampled = upsample(sample)
+
+        assert upsampled.shape == (1, 64, 64, 64)
+        output_slice = upsampled[0, -1, -3:, -3:]
+        expected_slice = torch.tensor([0.2703, 0.1656, -0.2538, -0.0553, -0.2984, 0.1044, 0.1155, 0.2579, 0.7755])
+        assert torch.allclose(output_slice.flatten(), expected_slice, atol=1e-3)
+
+    def test_upsample_with_transpose(self):
+        torch.manual_seed(0)
+        sample = torch.randn(1, 32, 32, 32)
+        upsample = Upsample(channels=32, use_conv=False, use_conv_transpose=True)
+        with torch.no_grad():
+            upsampled = upsample(sample)
+
+        assert upsampled.shape == (1, 32, 64, 64)
+        output_slice = upsampled[0, -1, -3:, -3:]
+        expected_slice = torch.tensor([-0.3028, -0.1582, 0.0071, 0.0350, -0.4799, -0.1139, 0.1056, -0.1153, -0.1046])
+        assert torch.allclose(output_slice.flatten(), expected_slice, atol=1e-3)