update unet2d (#1376)

* boom boom

* remove duplicate arg

* add use_linear_proj arg

* fix copies

* style

* add fast tests

* use_linear_proj -> use_linear_projection

src/diffusers/models/attention.py

@@ -99,8 +99,10 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
         num_vector_embeds: Optional[int] = None,
         activation_fn: str = "geglu",
         num_embeds_ada_norm: Optional[int] = None,
+        use_linear_projection: bool = False,
     ):
         super().__init__()
+        self.use_linear_projection = use_linear_projection
         self.num_attention_heads = num_attention_heads
         self.attention_head_dim = attention_head_dim
         inner_dim = num_attention_heads * attention_head_dim
@@ -126,7 +128,10 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
             self.in_channels = in_channels
 
             self.norm = torch.nn.GroupNorm(num_groups=norm_num_groups, num_channels=in_channels, eps=1e-6, affine=True)
-            self.proj_in = nn.Conv2d(in_channels, inner_dim, kernel_size=1, stride=1, padding=0)
+            if use_linear_projection:
+                self.proj_in = nn.Linear(in_channels, inner_dim)
+            else:
+                self.proj_in = nn.Conv2d(in_channels, inner_dim, kernel_size=1, stride=1, padding=0)
         elif self.is_input_vectorized:
             assert sample_size is not None, "Transformer2DModel over discrete input must provide sample_size"
             assert num_vector_embeds is not None, "Transformer2DModel over discrete input must provide num_embed"
@@ -159,7 +164,10 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
 
         # 4. Define output layers
         if self.is_input_continuous:
-            self.proj_out = nn.Conv2d(inner_dim, in_channels, kernel_size=1, stride=1, padding=0)
+            if use_linear_projection:
+                self.proj_out = nn.Linear(in_channels, inner_dim)
+            else:
+                self.proj_out = nn.Conv2d(inner_dim, in_channels, kernel_size=1, stride=1, padding=0)
         elif self.is_input_vectorized:
             self.norm_out = nn.LayerNorm(inner_dim)
             self.out = nn.Linear(inner_dim, self.num_vector_embeds - 1)
@@ -191,10 +199,18 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
         if self.is_input_continuous:
             batch, channel, height, weight = hidden_states.shape
             residual = hidden_states
+
             hidden_states = self.norm(hidden_states)
-            hidden_states = self.proj_in(hidden_states)
-            inner_dim = hidden_states.shape[1]
-            hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+
+            if not self.use_linear_projection:
+                hidden_states = self.proj_in(hidden_states)
+                inner_dim = hidden_states.shape[1]
+                hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+            else:
+                hidden_states = self.norm(hidden_states)
+                inner_dim = hidden_states.shape[1]
+                hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+                hidden_states = self.proj_in(hidden_states)
         elif self.is_input_vectorized:
             hidden_states = self.latent_image_embedding(hidden_states)
 
@@ -204,8 +220,13 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
 
         # 3. Output
         if self.is_input_continuous:
-            hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
-            hidden_states = self.proj_out(hidden_states)
+            if not self.use_linear_projection:
+                hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
+                hidden_states = self.proj_out(hidden_states)
+            else:
+                hidden_states = self.proj_out(hidden_states)
+                hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
+
             output = hidden_states + residual
         elif self.is_input_vectorized:
             hidden_states = self.norm_out(hidden_states)

src/diffusers/models/unet_2d_blocks.py

@@ -33,6 +33,7 @@ def get_down_block(
     cross_attention_dim=None,
     downsample_padding=None,
     dual_cross_attention=False,
+    use_linear_projection=False,
 ):
     down_block_type = down_block_type[7:] if down_block_type.startswith("UNetRes") else down_block_type
     if down_block_type == "DownBlock2D":
@@ -76,6 +77,7 @@ def get_down_block(
             cross_attention_dim=cross_attention_dim,
             attn_num_head_channels=attn_num_head_channels,
             dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
         )
     elif down_block_type == "SkipDownBlock2D":
         return SkipDownBlock2D(
@@ -140,6 +142,7 @@ def get_up_block(
     resnet_groups=None,
     cross_attention_dim=None,
     dual_cross_attention=False,
+    use_linear_projection=False,
 ):
     up_block_type = up_block_type[7:] if up_block_type.startswith("UNetRes") else up_block_type
     if up_block_type == "UpBlock2D":
@@ -170,6 +173,7 @@ def get_up_block(
             cross_attention_dim=cross_attention_dim,
             attn_num_head_channels=attn_num_head_channels,
             dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
         )
     elif up_block_type == "AttnUpBlock2D":
         return AttnUpBlock2D(
@@ -327,6 +331,7 @@ class UNetMidBlock2DCrossAttn(nn.Module):
         output_scale_factor=1.0,
         cross_attention_dim=1280,
         dual_cross_attention=False,
+        use_linear_projection=False,
         **kwargs,
     ):
         super().__init__()
@@ -362,6 +367,7 @@ class UNetMidBlock2DCrossAttn(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:
@@ -523,6 +529,7 @@ class CrossAttnDownBlock2D(nn.Module):
         downsample_padding=1,
         add_downsample=True,
         dual_cross_attention=False,
+        use_linear_projection=False,
     ):
         super().__init__()
         resnets = []
@@ -556,6 +563,7 @@ class CrossAttnDownBlock2D(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:
@@ -1120,6 +1128,7 @@ class CrossAttnUpBlock2D(nn.Module):
         output_scale_factor=1.0,
         add_upsample=True,
         dual_cross_attention=False,
+        use_linear_projection=False,
     ):
         super().__init__()
         resnets = []
@@ -1155,6 +1164,7 @@ class CrossAttnUpBlock2D(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:

src/diffusers/models/unet_2d_condition.py

@@ -61,7 +61,7 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         in_channels (`int`, *optional*, defaults to 4): The number of channels in the input sample.
         out_channels (`int`, *optional*, defaults to 4): The number of channels in the output.
         center_input_sample (`bool`, *optional*, defaults to `False`): Whether to center the input sample.
-        flip_sin_to_cos (`bool`, *optional*, defaults to `True`):
+        flip_sin_to_cos (`bool`, *optional*, defaults to `False`):
             Whether to flip the sin to cos in the time embedding.
         freq_shift (`int`, *optional*, defaults to 0): The frequency shift to apply to the time embedding.
         down_block_types (`Tuple[str]`, *optional*, defaults to `("CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "DownBlock2D")`):
@@ -106,8 +106,9 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         norm_num_groups: int = 32,
         norm_eps: float = 1e-5,
         cross_attention_dim: int = 1280,
-        attention_head_dim: int = 8,
+        attention_head_dim: Union[int, Tuple[int]] = 8,
         dual_cross_attention: bool = False,
+        use_linear_projection: bool = False,
     ):
         super().__init__()
 
@@ -127,6 +128,9 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         self.mid_block = None
         self.up_blocks = nn.ModuleList([])
 
+        if isinstance(attention_head_dim, int):
+            attention_head_dim = (attention_head_dim,) * len(down_block_types)
+
         # down
         output_channel = block_out_channels[0]
         for i, down_block_type in enumerate(down_block_types):
@@ -145,9 +149,10 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=attention_head_dim[i],
                 downsample_padding=downsample_padding,
                 dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
             )
             self.down_blocks.append(down_block)
 
@@ -160,9 +165,10 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
             output_scale_factor=mid_block_scale_factor,
             resnet_time_scale_shift="default",
             cross_attention_dim=cross_attention_dim,
-            attn_num_head_channels=attention_head_dim,
+            attn_num_head_channels=attention_head_dim[-1],
             resnet_groups=norm_num_groups,
             dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
         )
 
         # count how many layers upsample the images
@@ -170,6 +176,7 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
 
         # up
         reversed_block_out_channels = list(reversed(block_out_channels))
+        reversed_attention_head_dim = list(reversed(attention_head_dim))
         output_channel = reversed_block_out_channels[0]
         for i, up_block_type in enumerate(up_block_types):
             is_final_block = i == len(block_out_channels) - 1
@@ -197,8 +204,9 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=reversed_attention_head_dim[i],
                 dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
             )
             self.up_blocks.append(up_block)
             prev_output_channel = output_channel
@@ -256,8 +264,7 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         Args:
             sample (`torch.FloatTensor`): (batch, channel, height, width) noisy inputs tensor
             timestep (`torch.FloatTensor` or `float` or `int`): (batch) timesteps
-            encoder_hidden_states (`torch.FloatTensor`):
-                (batch_size, sequence_length, hidden_size) encoder hidden states
+            encoder_hidden_states (`torch.FloatTensor`): (batch, channel, height, width) encoder hidden states
             return_dict (`bool`, *optional*, defaults to `True`):
                 Whether or not to return a [`models.unet_2d_condition.UNet2DConditionOutput`] instead of a plain tuple.
 

src/diffusers/pipelines/versatile_diffusion/modeling_text_unet.py

@@ -124,7 +124,7 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
         in_channels (`int`, *optional*, defaults to 4): The number of channels in the input sample.
         out_channels (`int`, *optional*, defaults to 4): The number of channels in the output.
         center_input_sample (`bool`, *optional*, defaults to `False`): Whether to center the input sample.
-        flip_sin_to_cos (`bool`, *optional*, defaults to `True`):
+        flip_sin_to_cos (`bool`, *optional*, defaults to `False`):
             Whether to flip the sin to cos in the time embedding.
         freq_shift (`int`, *optional*, defaults to 0): The frequency shift to apply to the time embedding.
         down_block_types (`Tuple[str]`, *optional*, defaults to `("CrossAttnDownBlockFlat", "CrossAttnDownBlockFlat", "CrossAttnDownBlockFlat", "DownBlockFlat")`):
@@ -174,8 +174,9 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
         norm_num_groups: int = 32,
         norm_eps: float = 1e-5,
         cross_attention_dim: int = 1280,
-        attention_head_dim: int = 8,
+        attention_head_dim: Union[int, Tuple[int]] = 8,
         dual_cross_attention: bool = False,
+        use_linear_projection: bool = False,
     ):
         super().__init__()
 
@@ -195,6 +196,9 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
         self.mid_block = None
         self.up_blocks = nn.ModuleList([])
 
+        if isinstance(attention_head_dim, int):
+            attention_head_dim = (attention_head_dim,) * len(down_block_types)
+
         # down
         output_channel = block_out_channels[0]
         for i, down_block_type in enumerate(down_block_types):
@@ -213,9 +217,10 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=attention_head_dim[i],
                 downsample_padding=downsample_padding,
                 dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
             )
             self.down_blocks.append(down_block)
 
@@ -228,9 +233,10 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
             output_scale_factor=mid_block_scale_factor,
             resnet_time_scale_shift="default",
             cross_attention_dim=cross_attention_dim,
-            attn_num_head_channels=attention_head_dim,
+            attn_num_head_channels=attention_head_dim[-1],
             resnet_groups=norm_num_groups,
             dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
         )
 
         # count how many layers upsample the images
@@ -238,6 +244,7 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
 
         # up
         reversed_block_out_channels = list(reversed(block_out_channels))
+        reversed_attention_head_dim = list(reversed(attention_head_dim))
         output_channel = reversed_block_out_channels[0]
         for i, up_block_type in enumerate(up_block_types):
             is_final_block = i == len(block_out_channels) - 1
@@ -265,8 +272,9 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=reversed_attention_head_dim[i],
                 dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
             )
             self.up_blocks.append(up_block)
             prev_output_channel = output_channel
@@ -324,8 +332,7 @@ class UNetFlatConditionModel(ModelMixin, ConfigMixin):
         Args:
             sample (`torch.FloatTensor`): (batch, channel, height, width) noisy inputs tensor
             timestep (`torch.FloatTensor` or `float` or `int`): (batch) timesteps
-            encoder_hidden_states (`torch.FloatTensor`):
-                (batch_size, sequence_length, hidden_size) encoder hidden states
+            encoder_hidden_states (`torch.FloatTensor`): (batch, channel, height, width) encoder hidden states
             return_dict (`bool`, *optional*, defaults to `True`):
                 Whether or not to return a [`models.unet_2d_condition.UNet2DConditionOutput`] instead of a plain tuple.
 
@@ -640,6 +647,7 @@ class CrossAttnDownBlockFlat(nn.Module):
         downsample_padding=1,
         add_downsample=True,
         dual_cross_attention=False,
+        use_linear_projection=False,
     ):
         super().__init__()
         resnets = []
@@ -673,6 +681,7 @@ class CrossAttnDownBlockFlat(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:
@@ -851,6 +860,7 @@ class CrossAttnUpBlockFlat(nn.Module):
         output_scale_factor=1.0,
         add_upsample=True,
         dual_cross_attention=False,
+        use_linear_projection=False,
     ):
         super().__init__()
         resnets = []
@@ -886,6 +896,7 @@ class CrossAttnUpBlockFlat(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:
@@ -988,6 +999,7 @@ class UNetMidBlockFlatCrossAttn(nn.Module):
         output_scale_factor=1.0,
         cross_attention_dim=1280,
         dual_cross_attention=False,
+        use_linear_projection=False,
         **kwargs,
     ):
         super().__init__()
@@ -1023,6 +1035,7 @@ class UNetMidBlockFlatCrossAttn(nn.Module):
                         num_layers=1,
                         cross_attention_dim=cross_attention_dim,
                         norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
                     )
                 )
             else:

tests/models/test_models_unet_2d.py

@@ -296,6 +296,44 @@ class UNet2DConditionModelTests(ModelTesterMixin, unittest.TestCase):
         for name, param in named_params.items():
             self.assertTrue(torch_all_close(param.grad.data, named_params_2[name].grad.data, atol=5e-5))
 
+    def test_model_with_attention_head_dim_tuple(self):
+        init_dict, inputs_dict = self.prepare_init_args_and_inputs_for_common()
+
+        init_dict["attention_head_dim"] = (8, 16)
+
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+        model.eval()
+
+        with torch.no_grad():
+            output = model(**inputs_dict)
+
+            if isinstance(output, dict):
+                output = output.sample
+
+        self.assertIsNotNone(output)
+        expected_shape = inputs_dict["sample"].shape
+        self.assertEqual(output.shape, expected_shape, "Input and output shapes do not match")
+
+    def test_model_with_use_linear_projection(self):
+        init_dict, inputs_dict = self.prepare_init_args_and_inputs_for_common()
+
+        init_dict["use_linear_projection"] = True
+
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+        model.eval()
+
+        with torch.no_grad():
+            output = model(**inputs_dict)
+
+            if isinstance(output, dict):
+                output = output.sample
+
+        self.assertIsNotNone(output)
+        expected_shape = inputs_dict["sample"].shape
+        self.assertEqual(output.shape, expected_shape, "Input and output shapes do not match")
+
 
 class NCSNppModelTests(ModelTesterMixin, unittest.TestCase):
     model_class = UNet2DModel