2023-04-15 16:44:20 +00:00
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# This file contains a mix of Apache and GPL code and should be treated as a GPL resource
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#
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# Original attribution:
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#
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2023-04-12 00:29:25 +00:00
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# Copyright 2023 The HuggingFace Team. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from dataclasses import dataclass
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from typing import Dict, List, Optional, Tuple, Union
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import torch
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import torch.nn as nn
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import torch.utils.checkpoint
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from diffusers.configuration_utils import ConfigMixin, register_to_config
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from diffusers.loaders import UNet2DConditionLoadersMixin
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from diffusers.models.cross_attention import AttnProcessor
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from diffusers.models.embeddings import (
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GaussianFourierProjection,
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TimestepEmbedding,
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Timesteps,
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)
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from diffusers.models.modeling_utils import ModelMixin
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from diffusers.models.unet_2d_blocks import (
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CrossAttnDownBlock2D,
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CrossAttnUpBlock2D,
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DownBlock2D,
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UNetMidBlock2DCrossAttn,
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UNetMidBlock2DSimpleCrossAttn,
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UpBlock2D,
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get_down_block,
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get_up_block,
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)
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from diffusers.utils import BaseOutput, logging
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logger = logging.get_logger(__name__) # pylint: disable=invalid-name
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@dataclass
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class UNet2DConditionOutput(BaseOutput):
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"""
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Args:
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sample (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
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Hidden states conditioned on `encoder_hidden_states` input. Output of last layer of model.
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"""
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sample: torch.FloatTensor
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class UNet2DConditionModel_CNet(ModelMixin, ConfigMixin, UNet2DConditionLoadersMixin):
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r"""
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UNet2DConditionModel is a conditional 2D UNet model that takes in a noisy sample, conditional state, and a timestep
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and returns sample shaped output.
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This model inherits from [`ModelMixin`]. Check the superclass documentation for the generic methods the library
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implements for all the models (such as downloading or saving, etc.)
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Parameters:
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sample_size (`int` or `Tuple[int, int]`, *optional*, defaults to `None`):
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Height and width of input/output sample.
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in_channels (`int`, *optional*, defaults to 4): The number of channels in the input sample.
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out_channels (`int`, *optional*, defaults to 4): The number of channels in the output.
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center_input_sample (`bool`, *optional*, defaults to `False`): Whether to center the input sample.
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flip_sin_to_cos (`bool`, *optional*, defaults to `False`):
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Whether to flip the sin to cos in the time embedding.
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freq_shift (`int`, *optional*, defaults to 0): The frequency shift to apply to the time embedding.
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down_block_types (`Tuple[str]`, *optional*, defaults to `("CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "DownBlock2D")`):
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The tuple of downsample blocks to use.
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mid_block_type (`str`, *optional*, defaults to `"UNetMidBlock2DCrossAttn"`):
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The mid block type. Choose from `UNetMidBlock2DCrossAttn` or `UNetMidBlock2DSimpleCrossAttn`, will skip the
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mid block layer if `None`.
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up_block_types (`Tuple[str]`, *optional*, defaults to `("UpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D",)`):
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The tuple of upsample blocks to use.
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only_cross_attention(`bool` or `Tuple[bool]`, *optional*, default to `False`):
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Whether to include self-attention in the basic transformer blocks, see
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[`~models.attention.BasicTransformerBlock`].
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block_out_channels (`Tuple[int]`, *optional*, defaults to `(320, 640, 1280, 1280)`):
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The tuple of output channels for each block.
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layers_per_block (`int`, *optional*, defaults to 2): The number of layers per block.
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downsample_padding (`int`, *optional*, defaults to 1): The padding to use for the downsampling convolution.
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mid_block_scale_factor (`float`, *optional*, defaults to 1.0): The scale factor to use for the mid block.
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act_fn (`str`, *optional*, defaults to `"silu"`): The activation function to use.
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norm_num_groups (`int`, *optional*, defaults to 32): The number of groups to use for the normalization.
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If `None`, it will skip the normalization and activation layers in post-processing
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norm_eps (`float`, *optional*, defaults to 1e-5): The epsilon to use for the normalization.
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cross_attention_dim (`int`, *optional*, defaults to 1280): The dimension of the cross attention features.
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attention_head_dim (`int`, *optional*, defaults to 8): The dimension of the attention heads.
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resnet_time_scale_shift (`str`, *optional*, defaults to `"default"`): Time scale shift config
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for resnet blocks, see [`~models.resnet.ResnetBlock2D`]. Choose from `default` or `scale_shift`.
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class_embed_type (`str`, *optional*, defaults to None): The type of class embedding to use which is ultimately
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summed with the time embeddings. Choose from `None`, `"timestep"`, `"identity"`, or `"projection"`.
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num_class_embeds (`int`, *optional*, defaults to None):
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Input dimension of the learnable embedding matrix to be projected to `time_embed_dim`, when performing
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class conditioning with `class_embed_type` equal to `None`.
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time_embedding_type (`str`, *optional*, default to `positional`):
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The type of position embedding to use for timesteps. Choose from `positional` or `fourier`.
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timestep_post_act (`str, *optional*, default to `None`):
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The second activation function to use in timestep embedding. Choose from `silu`, `mish` and `gelu`.
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time_cond_proj_dim (`int`, *optional*, default to `None`):
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The dimension of `cond_proj` layer in timestep embedding.
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conv_in_kernel (`int`, *optional*, default to `3`): The kernel size of `conv_in` layer.
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conv_out_kernel (`int`, *optional*, default to `3`): The kernel size of `conv_out` layer.
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projection_class_embeddings_input_dim (`int`, *optional*): The dimension of the `class_labels` input when
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using the "projection" `class_embed_type`. Required when using the "projection" `class_embed_type`.
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"""
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_supports_gradient_checkpointing = True
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@register_to_config
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def __init__(
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self,
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sample_size: Optional[int] = None,
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in_channels: int = 4,
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out_channels: int = 4,
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center_input_sample: bool = False,
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flip_sin_to_cos: bool = True,
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freq_shift: int = 0,
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down_block_types: Tuple[str] = (
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"CrossAttnDownBlock2D",
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"CrossAttnDownBlock2D",
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"CrossAttnDownBlock2D",
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"DownBlock2D",
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),
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mid_block_type: Optional[str] = "UNetMidBlock2DCrossAttn",
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up_block_types: Tuple[str] = (
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"UpBlock2D",
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"CrossAttnUpBlock2D",
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"CrossAttnUpBlock2D",
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"CrossAttnUpBlock2D",
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),
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only_cross_attention: Union[bool, Tuple[bool]] = False,
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block_out_channels: Tuple[int] = (320, 640, 1280, 1280),
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layers_per_block: int = 2,
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downsample_padding: int = 1,
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mid_block_scale_factor: float = 1,
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act_fn: str = "silu",
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norm_num_groups: Optional[int] = 32,
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norm_eps: float = 1e-5,
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cross_attention_dim: int = 1280,
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attention_head_dim: Union[int, Tuple[int]] = 8,
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dual_cross_attention: bool = False,
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use_linear_projection: bool = False,
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class_embed_type: Optional[str] = None,
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num_class_embeds: Optional[int] = None,
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upcast_attention: bool = False,
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resnet_time_scale_shift: str = "default",
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time_embedding_type: str = "positional",
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timestep_post_act: Optional[str] = None,
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time_cond_proj_dim: Optional[int] = None,
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conv_in_kernel: int = 3,
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conv_out_kernel: int = 3,
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projection_class_embeddings_input_dim: Optional[int] = None,
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):
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super().__init__()
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self.sample_size = sample_size
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# Check inputs
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if len(down_block_types) != len(up_block_types):
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raise ValueError(
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2023-04-13 01:06:13 +00:00
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f"Must provide the same number of `down_block_types` as `up_block_types`."
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f"`down_block_types`: {down_block_types}. `up_block_types`: {up_block_types}."
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2023-04-12 00:29:25 +00:00
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)
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if len(block_out_channels) != len(down_block_types):
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raise ValueError(
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2023-04-13 01:06:13 +00:00
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f"Must provide the same number of `block_out_channels` as `down_block_types`."
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f"`block_out_channels`: {block_out_channels}. `down_block_types`: {down_block_types}."
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2023-04-12 00:29:25 +00:00
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)
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if not isinstance(only_cross_attention, bool) and len(
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only_cross_attention
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) != len(down_block_types):
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raise ValueError(
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2023-04-13 01:06:13 +00:00
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f"Must provide the same number of `only_cross_attention` as `down_block_types`."
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f"`only_cross_attention`: {only_cross_attention}. `down_block_types`: {down_block_types}."
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2023-04-12 00:29:25 +00:00
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)
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if not isinstance(attention_head_dim, int) and len(attention_head_dim) != len(
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down_block_types
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):
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raise ValueError(
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2023-04-13 01:06:13 +00:00
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f"Must provide the same number of `attention_head_dim` as `down_block_types`."
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f"`attention_head_dim`: {attention_head_dim}. `down_block_types`: {down_block_types}."
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2023-04-12 00:29:25 +00:00
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)
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# input
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conv_in_padding = (conv_in_kernel - 1) // 2
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self.conv_in = nn.Conv2d(
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in_channels,
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block_out_channels[0],
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kernel_size=conv_in_kernel,
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padding=conv_in_padding,
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)
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# time
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if time_embedding_type == "fourier":
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time_embed_dim = block_out_channels[0] * 2
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if time_embed_dim % 2 != 0:
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raise ValueError(
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f"`time_embed_dim` should be divisible by 2, but is {time_embed_dim}."
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)
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self.time_proj = GaussianFourierProjection(
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time_embed_dim // 2,
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set_W_to_weight=False,
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log=False,
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flip_sin_to_cos=flip_sin_to_cos,
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)
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timestep_input_dim = time_embed_dim
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elif time_embedding_type == "positional":
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time_embed_dim = block_out_channels[0] * 4
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self.time_proj = Timesteps(
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block_out_channels[0], flip_sin_to_cos, freq_shift
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)
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timestep_input_dim = block_out_channels[0]
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else:
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raise ValueError(
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f"{time_embedding_type} does not exist. Pleaes make sure to use one of `fourier` or `positional`."
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)
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self.time_embedding = TimestepEmbedding(
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timestep_input_dim,
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time_embed_dim,
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act_fn=act_fn,
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post_act_fn=timestep_post_act,
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cond_proj_dim=time_cond_proj_dim,
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)
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# class embedding
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if class_embed_type is None and num_class_embeds is not None:
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self.class_embedding = nn.Embedding(num_class_embeds, time_embed_dim)
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elif class_embed_type == "timestep":
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self.class_embedding = TimestepEmbedding(timestep_input_dim, time_embed_dim)
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elif class_embed_type == "identity":
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self.class_embedding = nn.Identity(time_embed_dim, time_embed_dim)
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elif class_embed_type == "projection":
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if projection_class_embeddings_input_dim is None:
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raise ValueError(
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"`class_embed_type`: 'projection' requires `projection_class_embeddings_input_dim` be set"
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)
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# The projection `class_embed_type` is the same as the timestep `class_embed_type` except
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# 1. the `class_labels` inputs are not first converted to sinusoidal embeddings
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# 2. it projects from an arbitrary input dimension.
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#
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# Note that `TimestepEmbedding` is quite general, being mainly linear layers and activations.
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# When used for embedding actual timesteps, the timesteps are first converted to sinusoidal embeddings.
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# As a result, `TimestepEmbedding` can be passed arbitrary vectors.
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self.class_embedding = TimestepEmbedding(
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projection_class_embeddings_input_dim, time_embed_dim
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)
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else:
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self.class_embedding = None
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self.down_blocks = nn.ModuleList([])
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self.up_blocks = nn.ModuleList([])
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if isinstance(only_cross_attention, bool):
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only_cross_attention = [only_cross_attention] * len(down_block_types)
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if isinstance(attention_head_dim, int):
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attention_head_dim = (attention_head_dim,) * len(down_block_types)
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# down
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output_channel = block_out_channels[0]
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for i, down_block_type in enumerate(down_block_types):
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input_channel = output_channel
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output_channel = block_out_channels[i]
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is_final_block = i == len(block_out_channels) - 1
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down_block = get_down_block(
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down_block_type,
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num_layers=layers_per_block,
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in_channels=input_channel,
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out_channels=output_channel,
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temb_channels=time_embed_dim,
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add_downsample=not is_final_block,
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resnet_eps=norm_eps,
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resnet_act_fn=act_fn,
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resnet_groups=norm_num_groups,
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cross_attention_dim=cross_attention_dim,
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attn_num_head_channels=attention_head_dim[i],
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downsample_padding=downsample_padding,
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dual_cross_attention=dual_cross_attention,
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use_linear_projection=use_linear_projection,
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only_cross_attention=only_cross_attention[i],
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upcast_attention=upcast_attention,
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resnet_time_scale_shift=resnet_time_scale_shift,
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)
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self.down_blocks.append(down_block)
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# mid
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if mid_block_type == "UNetMidBlock2DCrossAttn":
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self.mid_block = UNetMidBlock2DCrossAttn(
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in_channels=block_out_channels[-1],
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temb_channels=time_embed_dim,
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resnet_eps=norm_eps,
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resnet_act_fn=act_fn,
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output_scale_factor=mid_block_scale_factor,
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resnet_time_scale_shift=resnet_time_scale_shift,
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cross_attention_dim=cross_attention_dim,
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attn_num_head_channels=attention_head_dim[-1],
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resnet_groups=norm_num_groups,
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dual_cross_attention=dual_cross_attention,
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use_linear_projection=use_linear_projection,
|
|
|
|
upcast_attention=upcast_attention,
|
|
|
|
)
|
|
|
|
elif mid_block_type == "UNetMidBlock2DSimpleCrossAttn":
|
|
|
|
self.mid_block = UNetMidBlock2DSimpleCrossAttn(
|
|
|
|
in_channels=block_out_channels[-1],
|
|
|
|
temb_channels=time_embed_dim,
|
|
|
|
resnet_eps=norm_eps,
|
|
|
|
resnet_act_fn=act_fn,
|
|
|
|
output_scale_factor=mid_block_scale_factor,
|
|
|
|
cross_attention_dim=cross_attention_dim,
|
|
|
|
attn_num_head_channels=attention_head_dim[-1],
|
|
|
|
resnet_groups=norm_num_groups,
|
|
|
|
resnet_time_scale_shift=resnet_time_scale_shift,
|
|
|
|
)
|
|
|
|
elif mid_block_type is None:
|
|
|
|
self.mid_block = None
|
|
|
|
else:
|
|
|
|
raise ValueError(f"unknown mid_block_type : {mid_block_type}")
|
|
|
|
|
|
|
|
# count how many layers upsample the images
|
|
|
|
self.num_upsamplers = 0
|
|
|
|
|
|
|
|
# up
|
|
|
|
reversed_block_out_channels = list(reversed(block_out_channels))
|
|
|
|
reversed_attention_head_dim = list(reversed(attention_head_dim))
|
|
|
|
only_cross_attention = list(reversed(only_cross_attention))
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
|
|
prev_output_channel = output_channel
|
|
|
|
output_channel = reversed_block_out_channels[i]
|
|
|
|
input_channel = reversed_block_out_channels[
|
|
|
|
min(i + 1, len(block_out_channels) - 1)
|
|
|
|
]
|
|
|
|
|
|
|
|
# add upsample block for all BUT final layer
|
|
|
|
if not is_final_block:
|
|
|
|
add_upsample = True
|
|
|
|
self.num_upsamplers += 1
|
|
|
|
else:
|
|
|
|
add_upsample = False
|
|
|
|
|
|
|
|
up_block = get_up_block(
|
|
|
|
up_block_type,
|
|
|
|
num_layers=layers_per_block + 1,
|
|
|
|
in_channels=input_channel,
|
|
|
|
out_channels=output_channel,
|
|
|
|
prev_output_channel=prev_output_channel,
|
|
|
|
temb_channels=time_embed_dim,
|
|
|
|
add_upsample=add_upsample,
|
|
|
|
resnet_eps=norm_eps,
|
|
|
|
resnet_act_fn=act_fn,
|
|
|
|
resnet_groups=norm_num_groups,
|
|
|
|
cross_attention_dim=cross_attention_dim,
|
|
|
|
attn_num_head_channels=reversed_attention_head_dim[i],
|
|
|
|
dual_cross_attention=dual_cross_attention,
|
|
|
|
use_linear_projection=use_linear_projection,
|
|
|
|
only_cross_attention=only_cross_attention[i],
|
|
|
|
upcast_attention=upcast_attention,
|
|
|
|
resnet_time_scale_shift=resnet_time_scale_shift,
|
|
|
|
)
|
|
|
|
self.up_blocks.append(up_block)
|
|
|
|
prev_output_channel = output_channel
|
|
|
|
|
|
|
|
# out
|
|
|
|
if norm_num_groups is not None:
|
|
|
|
self.conv_norm_out = nn.GroupNorm(
|
|
|
|
num_channels=block_out_channels[0],
|
|
|
|
num_groups=norm_num_groups,
|
|
|
|
eps=norm_eps,
|
|
|
|
)
|
|
|
|
self.conv_act = nn.SiLU()
|
|
|
|
else:
|
|
|
|
self.conv_norm_out = None
|
|
|
|
self.conv_act = None
|
|
|
|
|
|
|
|
conv_out_padding = (conv_out_kernel - 1) // 2
|
|
|
|
self.conv_out = nn.Conv2d(
|
|
|
|
block_out_channels[0],
|
|
|
|
out_channels,
|
|
|
|
kernel_size=conv_out_kernel,
|
|
|
|
padding=conv_out_padding,
|
|
|
|
)
|
|
|
|
|
|
|
|
@property
|
|
|
|
def attn_processors(self) -> Dict[str, AttnProcessor]:
|
|
|
|
r"""
|
|
|
|
Returns:
|
|
|
|
`dict` of attention processors: A dictionary containing all attention processors used in the model with
|
|
|
|
indexed by its weight name.
|
|
|
|
"""
|
|
|
|
# set recursively
|
|
|
|
processors = {}
|
|
|
|
|
|
|
|
def fn_recursive_add_processors(
|
|
|
|
name: str, module: torch.nn.Module, processors: Dict[str, AttnProcessor]
|
|
|
|
):
|
|
|
|
if hasattr(module, "set_processor"):
|
|
|
|
processors[f"{name}.processor"] = module.processor
|
|
|
|
|
|
|
|
for sub_name, child in module.named_children():
|
|
|
|
fn_recursive_add_processors(f"{name}.{sub_name}", child, processors)
|
|
|
|
|
|
|
|
return processors
|
|
|
|
|
|
|
|
for name, module in self.named_children():
|
|
|
|
fn_recursive_add_processors(name, module, processors)
|
|
|
|
|
|
|
|
return processors
|
|
|
|
|
|
|
|
def set_attn_processor(
|
|
|
|
self, processor: Union[AttnProcessor, Dict[str, AttnProcessor]]
|
|
|
|
):
|
|
|
|
r"""
|
|
|
|
Parameters:
|
|
|
|
`processor (`dict` of `AttnProcessor` or `AttnProcessor`):
|
|
|
|
The instantiated processor class or a dictionary of processor classes that will be set as the processor
|
|
|
|
of **all** `CrossAttention` layers.
|
2023-04-13 01:06:13 +00:00
|
|
|
In case `processor` is a dict, the key needs to define the path to the corresponding cross attention processor.
|
|
|
|
This is strongly recommended when setting trainable attention processors.
|
2023-04-12 00:29:25 +00:00
|
|
|
"""
|
|
|
|
count = len(self.attn_processors.keys())
|
|
|
|
|
|
|
|
if isinstance(processor, dict) and len(processor) != count:
|
|
|
|
raise ValueError(
|
|
|
|
f"A dict of processors was passed, but the number of processors {len(processor)} does not match the"
|
|
|
|
f" number of attention layers: {count}. Please make sure to pass {count} processor classes."
|
|
|
|
)
|
|
|
|
|
|
|
|
def fn_recursive_attn_processor(name: str, module: torch.nn.Module, processor):
|
|
|
|
if hasattr(module, "set_processor"):
|
|
|
|
if not isinstance(processor, dict):
|
|
|
|
module.set_processor(processor)
|
|
|
|
else:
|
|
|
|
module.set_processor(processor.pop(f"{name}.processor"))
|
|
|
|
|
|
|
|
for sub_name, child in module.named_children():
|
|
|
|
fn_recursive_attn_processor(f"{name}.{sub_name}", child, processor)
|
|
|
|
|
|
|
|
for name, module in self.named_children():
|
|
|
|
fn_recursive_attn_processor(name, module, processor)
|
|
|
|
|
|
|
|
def set_attention_slice(self, slice_size):
|
|
|
|
r"""
|
|
|
|
Enable sliced attention computation.
|
|
|
|
When this option is enabled, the attention module will split the input tensor in slices, to compute attention
|
|
|
|
in several steps. This is useful to save some memory in exchange for a small speed decrease.
|
|
|
|
Args:
|
|
|
|
slice_size (`str` or `int` or `list(int)`, *optional*, defaults to `"auto"`):
|
|
|
|
When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
|
|
|
|
`"max"`, maxium amount of memory will be saved by running only one slice at a time. If a number is
|
|
|
|
provided, uses as many slices as `attention_head_dim // slice_size`. In this case, `attention_head_dim`
|
|
|
|
must be a multiple of `slice_size`.
|
|
|
|
"""
|
|
|
|
sliceable_head_dims = []
|
|
|
|
|
|
|
|
def fn_recursive_retrieve_slicable_dims(module: torch.nn.Module):
|
|
|
|
if hasattr(module, "set_attention_slice"):
|
|
|
|
sliceable_head_dims.append(module.sliceable_head_dim)
|
|
|
|
|
|
|
|
for child in module.children():
|
|
|
|
fn_recursive_retrieve_slicable_dims(child)
|
|
|
|
|
|
|
|
# retrieve number of attention layers
|
|
|
|
for module in self.children():
|
|
|
|
fn_recursive_retrieve_slicable_dims(module)
|
|
|
|
|
|
|
|
num_slicable_layers = len(sliceable_head_dims)
|
|
|
|
|
|
|
|
if slice_size == "auto":
|
|
|
|
# half the attention head size is usually a good trade-off between
|
|
|
|
# speed and memory
|
|
|
|
slice_size = [dim // 2 for dim in sliceable_head_dims]
|
|
|
|
elif slice_size == "max":
|
|
|
|
# make smallest slice possible
|
|
|
|
slice_size = num_slicable_layers * [1]
|
|
|
|
|
|
|
|
slice_size = (
|
|
|
|
num_slicable_layers * [slice_size]
|
|
|
|
if not isinstance(slice_size, list)
|
|
|
|
else slice_size
|
|
|
|
)
|
|
|
|
|
|
|
|
if len(slice_size) != len(sliceable_head_dims):
|
|
|
|
raise ValueError(
|
|
|
|
f"You have provided {len(slice_size)}, but {self.config} has {len(sliceable_head_dims)} different"
|
|
|
|
f" attention layers. Make sure to match `len(slice_size)` to be {len(sliceable_head_dims)}."
|
|
|
|
)
|
|
|
|
|
|
|
|
for i in range(len(slice_size)):
|
|
|
|
size = slice_size[i]
|
|
|
|
dim = sliceable_head_dims[i]
|
|
|
|
if size is not None and size > dim:
|
|
|
|
raise ValueError(f"size {size} has to be smaller or equal to {dim}.")
|
|
|
|
|
|
|
|
# Recursively walk through all the children.
|
|
|
|
# Any children which exposes the set_attention_slice method
|
|
|
|
# gets the message
|
|
|
|
def fn_recursive_set_attention_slice(
|
|
|
|
module: torch.nn.Module, slice_size: List[int]
|
|
|
|
):
|
|
|
|
if hasattr(module, "set_attention_slice"):
|
|
|
|
module.set_attention_slice(slice_size.pop())
|
|
|
|
|
|
|
|
for child in module.children():
|
|
|
|
fn_recursive_set_attention_slice(child, slice_size)
|
|
|
|
|
|
|
|
reversed_slice_size = list(reversed(slice_size))
|
|
|
|
for module in self.children():
|
|
|
|
fn_recursive_set_attention_slice(module, reversed_slice_size)
|
|
|
|
|
|
|
|
def _set_gradient_checkpointing(self, module, value=False):
|
|
|
|
if isinstance(
|
|
|
|
module, (CrossAttnDownBlock2D, DownBlock2D, CrossAttnUpBlock2D, UpBlock2D)
|
|
|
|
):
|
|
|
|
module.gradient_checkpointing = value
|
|
|
|
|
|
|
|
def forward(
|
|
|
|
self,
|
|
|
|
sample: torch.FloatTensor,
|
|
|
|
timestep: Union[torch.Tensor, float, int],
|
|
|
|
encoder_hidden_states: torch.Tensor,
|
|
|
|
# class_labels: Optional[torch.Tensor] = None,
|
|
|
|
# timestep_cond: Optional[torch.Tensor] = None,
|
|
|
|
# attention_mask: Optional[torch.Tensor] = None,
|
|
|
|
# cross_attention_kwargs: Optional[Dict[str, Any]] = None,
|
|
|
|
down_block_additional_residuals0: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals1: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals2: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals3: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals4: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals5: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals6: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals7: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals8: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals9: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals10: Optional[torch.Tensor] = None,
|
|
|
|
down_block_additional_residuals11: Optional[torch.Tensor] = None,
|
|
|
|
mid_block_additional_residual: Optional[torch.Tensor] = None,
|
|
|
|
return_dict: bool = False,
|
|
|
|
) -> Union[UNet2DConditionOutput, Tuple]:
|
|
|
|
r"""
|
|
|
|
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, sequence_length, feature_dim) 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.
|
|
|
|
cross_attention_kwargs (`dict`, *optional*):
|
|
|
|
A kwargs dictionary that if specified is passed along to the `AttnProcessor` as defined under
|
|
|
|
`self.processor` in
|
|
|
|
[diffusers.cross_attention](https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/cross_attention.py).
|
|
|
|
Returns:
|
|
|
|
[`~models.unet_2d_condition.UNet2DConditionOutput`] or `tuple`:
|
|
|
|
[`~models.unet_2d_condition.UNet2DConditionOutput`] if `return_dict` is True, otherwise a `tuple`. When
|
|
|
|
returning a tuple, the first element is the sample tensor.
|
|
|
|
"""
|
|
|
|
# By default samples have to be AT least a multiple of the overall upsampling factor.
|
|
|
|
# The overall upsampling factor is equal to 2 ** (# num of upsampling layears).
|
|
|
|
# However, the upsampling interpolation output size can be forced to fit any upsampling size
|
|
|
|
# on the fly if necessary.
|
|
|
|
|
|
|
|
class_labels = None
|
|
|
|
timestep_cond = None
|
|
|
|
attention_mask = None
|
|
|
|
cross_attention_kwargs = None
|
|
|
|
|
|
|
|
down_block_additional_residuals = (
|
|
|
|
down_block_additional_residuals0,
|
|
|
|
down_block_additional_residuals1,
|
|
|
|
down_block_additional_residuals2,
|
|
|
|
down_block_additional_residuals3,
|
|
|
|
down_block_additional_residuals4,
|
|
|
|
down_block_additional_residuals5,
|
|
|
|
down_block_additional_residuals6,
|
|
|
|
down_block_additional_residuals7,
|
|
|
|
down_block_additional_residuals8,
|
|
|
|
down_block_additional_residuals9,
|
|
|
|
down_block_additional_residuals10,
|
|
|
|
down_block_additional_residuals11,
|
|
|
|
)
|
|
|
|
default_overall_up_factor = 2**self.num_upsamplers
|
|
|
|
|
|
|
|
# upsample size should be forwarded when sample is not a multiple of `default_overall_up_factor`
|
|
|
|
forward_upsample_size = False
|
|
|
|
upsample_size = None
|
|
|
|
|
|
|
|
if any(s % default_overall_up_factor != 0 for s in sample.shape[-2:]):
|
|
|
|
logger.info("Forward upsample size to force interpolation output size.")
|
|
|
|
forward_upsample_size = True
|
|
|
|
|
|
|
|
# prepare attention_mask
|
|
|
|
if attention_mask is not None:
|
|
|
|
attention_mask = (1 - attention_mask.to(sample.dtype)) * -10000.0
|
|
|
|
attention_mask = attention_mask.unsqueeze(1)
|
|
|
|
|
|
|
|
# 0. center input if necessary
|
|
|
|
if self.config.center_input_sample:
|
|
|
|
sample = 2 * sample - 1.0
|
|
|
|
|
|
|
|
# 1. time
|
|
|
|
timesteps = timestep
|
|
|
|
if not torch.is_tensor(timesteps):
|
|
|
|
# TODO: this requires sync between CPU and GPU. So try to pass timesteps as tensors if you can
|
|
|
|
# This would be a good case for the `match` statement (Python 3.10+)
|
|
|
|
is_mps = sample.device.type == "mps"
|
|
|
|
if isinstance(timestep, float):
|
|
|
|
dtype = torch.float32 if is_mps else torch.float64
|
|
|
|
else:
|
|
|
|
dtype = torch.int32 if is_mps else torch.int64
|
|
|
|
timesteps = torch.tensor([timesteps], dtype=dtype, device=sample.device)
|
|
|
|
elif len(timesteps.shape) == 0:
|
|
|
|
timesteps = timesteps[None].to(sample.device)
|
|
|
|
|
|
|
|
# broadcast to batch dimension in a way that's compatible with ONNX/Core ML
|
|
|
|
timesteps = timesteps.expand(sample.shape[0])
|
|
|
|
|
|
|
|
t_emb = self.time_proj(timesteps)
|
|
|
|
|
|
|
|
# timesteps does not contain any weights and will always return f32 tensors
|
|
|
|
# but time_embedding might actually be running in fp16. so we need to cast here.
|
|
|
|
# there might be better ways to encapsulate this.
|
|
|
|
t_emb = t_emb.to(dtype=self.dtype)
|
|
|
|
|
|
|
|
emb = self.time_embedding(t_emb, timestep_cond)
|
|
|
|
|
|
|
|
if self.class_embedding is not None:
|
|
|
|
if class_labels is None:
|
|
|
|
raise ValueError(
|
|
|
|
"class_labels should be provided when num_class_embeds > 0"
|
|
|
|
)
|
|
|
|
|
|
|
|
if self.config.class_embed_type == "timestep":
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class_labels = self.time_proj(class_labels)
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class_emb = self.class_embedding(class_labels).to(dtype=self.dtype)
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emb = emb + class_emb
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# 2. pre-process
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sample = self.conv_in(sample)
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# 3. down
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down_block_res_samples = (sample,)
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for downsample_block in self.down_blocks:
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if (
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hasattr(downsample_block, "has_cross_attention")
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and downsample_block.has_cross_attention
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):
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sample, res_samples = downsample_block(
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hidden_states=sample,
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temb=emb,
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encoder_hidden_states=encoder_hidden_states,
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attention_mask=attention_mask,
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cross_attention_kwargs=cross_attention_kwargs,
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)
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else:
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sample, res_samples = downsample_block(hidden_states=sample, temb=emb)
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down_block_res_samples += res_samples
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if down_block_additional_residuals is not None:
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new_down_block_res_samples = ()
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for down_block_res_sample, down_block_additional_residual in zip(
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down_block_res_samples, down_block_additional_residuals
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):
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down_block_res_sample += down_block_additional_residual
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new_down_block_res_samples += (down_block_res_sample,)
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down_block_res_samples = new_down_block_res_samples
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# 4. mid
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if self.mid_block is not None:
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sample = self.mid_block(
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sample,
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emb,
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|
encoder_hidden_states=encoder_hidden_states,
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|
attention_mask=attention_mask,
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|
cross_attention_kwargs=cross_attention_kwargs,
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|
|
)
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if mid_block_additional_residual is not None:
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|
sample += mid_block_additional_residual
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|
|
# 5. up
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|
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|
for i, upsample_block in enumerate(self.up_blocks):
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|
is_final_block = i == len(self.up_blocks) - 1
|
|
|
|
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|
|
|
res_samples = down_block_res_samples[-len(upsample_block.resnets) :]
|
|
|
|
down_block_res_samples = down_block_res_samples[
|
|
|
|
: -len(upsample_block.resnets)
|
|
|
|
]
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|
|
|
|
# if we have not reached the final block and need to forward the
|
|
|
|
# upsample size, we do it here
|
|
|
|
if not is_final_block and forward_upsample_size:
|
|
|
|
upsample_size = down_block_res_samples[-1].shape[2:]
|
|
|
|
|
|
|
|
if (
|
|
|
|
hasattr(upsample_block, "has_cross_attention")
|
|
|
|
and upsample_block.has_cross_attention
|
|
|
|
):
|
|
|
|
sample = upsample_block(
|
|
|
|
hidden_states=sample,
|
|
|
|
temb=emb,
|
|
|
|
res_hidden_states_tuple=res_samples,
|
|
|
|
encoder_hidden_states=encoder_hidden_states,
|
|
|
|
cross_attention_kwargs=cross_attention_kwargs,
|
|
|
|
upsample_size=upsample_size,
|
|
|
|
attention_mask=attention_mask,
|
|
|
|
)
|
|
|
|
else:
|
|
|
|
sample = upsample_block(
|
|
|
|
hidden_states=sample,
|
|
|
|
temb=emb,
|
|
|
|
res_hidden_states_tuple=res_samples,
|
|
|
|
upsample_size=upsample_size,
|
|
|
|
)
|
|
|
|
|
|
|
|
# 6. post-process
|
|
|
|
if self.conv_norm_out:
|
|
|
|
sample = self.conv_norm_out(sample)
|
|
|
|
sample = self.conv_act(sample)
|
|
|
|
sample = self.conv_out(sample)
|
|
|
|
|
|
|
|
if not return_dict:
|
|
|
|
return (sample,)
|
|
|
|
|
|
|
|
return UNet2DConditionOutput(sample=sample)
|