Merge branch 'main' of https://github.com/huggingface/diffusers into main

src/diffusers/models/embeddings.py

+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# 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.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# unet.py
+def get_timestep_embedding(timesteps, embedding_dim):
+    """
+    This matches the implementation in Denoising Diffusion Probabilistic Models:
+    From Fairseq.
+    Build sinusoidal embeddings.
+    This matches the implementation in tensor2tensor, but differs slightly
+    from the description in Section 3.5 of "Attention Is All You Need".
+    """
+    assert len(timesteps.shape) == 1
+
+    half_dim = embedding_dim // 2
+    emb = math.log(10000) / (half_dim - 1)
+    emb = torch.exp(torch.arange(half_dim, dtype=torch.float32) * -emb)
+    emb = emb.to(device=timesteps.device)
+    emb = timesteps.float()[:, None] * emb[None, :]
+    emb = torch.cat([torch.sin(emb), torch.cos(emb)], dim=1)
+    if embedding_dim % 2 == 1:  # zero pad
+        emb = torch.nn.functional.pad(emb, (0, 1, 0, 0))
+    return emb
+
+# unet_glide.py
+def timestep_embedding(timesteps, dim, max_period=10000):
+    """
+    Create sinusoidal timestep embeddings.
+
+    :param timesteps: a 1-D Tensor of N indices, one per batch element.
+                      These may be fractional.
+    :param dim: the dimension of the output.
+    :param max_period: controls the minimum frequency of the embeddings.
+    :return: an [N x dim] Tensor of positional embeddings.
+    """
+    half = dim // 2
+    freqs = torch.exp(-math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32) / half).to(
+        device=timesteps.device
+    )
+    args = timesteps[:, None].float() * freqs[None]
+    embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
+    if dim % 2:
+        embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
+    return embedding

src/diffusers/models/unet_grad_tts.py

@@ -198,6 +198,7 @@ class UNetGradTTSModel(ModelMixin, ConfigMixin):
         if not isinstance(spk, type(None)):
             s = self.spk_mlp(spk)
 
+        
         t = self.time_pos_emb(timesteps, scale=self.pe_scale)
         t = self.mlp(t)
 

tests/test_modeling_utils.py

@@ -113,7 +113,7 @@ class ModelTesterMixin:
             new_image = new_model(**inputs_dict)
 
         max_diff = (image - new_image).abs().sum().item()
-        self.assertLessEqual(max_diff, 1e-5, "Models give different forward passes")
+        self.assertLessEqual(max_diff, 5e-5, "Models give different forward passes")
 
     def test_determinism(self):
         init_dict, inputs_dict = self.prepare_init_args_and_inputs_for_common()
@@ -431,11 +431,12 @@ class GlideTextToImageUNetModelTests(ModelTesterMixin, unittest.TestCase):
         emb = torch.randn((1, 16, model.config.transformer_dim)).to(torch_device)
         time_step = torch.tensor([10] * noise.shape[0], device=torch_device)
 
+        model.to(torch_device)
         with torch.no_grad():
             output = model(noise, time_step, emb)
 
         output, _ = torch.split(output, 3, dim=1)
-        output_slice = output[0, -1, -3:, -3:].flatten()
+        output_slice = output[0, -1, -3:, -3:].cpu().flatten()
         # fmt: off
         expected_output_slice = torch.tensor([2.7766, -10.3558, -14.9149, -0.9376, -14.9175, -17.7679, -5.5565, -12.9521, -12.9845])
         # fmt: on