mirror of
https://github.com/invoke-ai/InvokeAI
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181 lines
7.2 KiB
Python
181 lines
7.2 KiB
Python
# copied from https://github.com/tencent-ailab/IP-Adapter (Apache License 2.0)
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# and modified as needed
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# tencent-ailab comment:
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# modified from https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/attention_processor.py
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from diffusers.models.attention_processor import AttnProcessor2_0 as DiffusersAttnProcessor2_0
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from invokeai.backend.ip_adapter.ip_attention_weights import IPAttentionProcessorWeights
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# Create a version of AttnProcessor2_0 that is a sub-class of nn.Module. This is required for IP-Adapter state_dict
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# loading.
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class AttnProcessor2_0(DiffusersAttnProcessor2_0, nn.Module):
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def __init__(self):
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DiffusersAttnProcessor2_0.__init__(self)
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nn.Module.__init__(self)
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def __call__(
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self,
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attn,
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hidden_states,
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encoder_hidden_states=None,
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attention_mask=None,
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temb=None,
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ip_adapter_image_prompt_embeds=None,
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):
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"""Re-definition of DiffusersAttnProcessor2_0.__call__(...) that accepts and ignores the
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ip_adapter_image_prompt_embeds parameter.
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"""
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return DiffusersAttnProcessor2_0.__call__(
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self, attn, hidden_states, encoder_hidden_states, attention_mask, temb
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)
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class IPAttnProcessor2_0(torch.nn.Module):
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r"""
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Attention processor for IP-Adapater for PyTorch 2.0.
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Args:
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hidden_size (`int`):
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The hidden size of the attention layer.
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cross_attention_dim (`int`):
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The number of channels in the `encoder_hidden_states`.
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scale (`float`, defaults to 1.0):
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the weight scale of image prompt.
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"""
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def __init__(self, weights: list[IPAttentionProcessorWeights], scales: list[float]):
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super().__init__()
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if not hasattr(F, "scaled_dot_product_attention"):
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raise ImportError("AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0.")
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assert len(weights) == len(scales)
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self._weights = weights
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self._scales = scales
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def __call__(
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self,
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attn,
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hidden_states,
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encoder_hidden_states=None,
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attention_mask=None,
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temb=None,
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ip_adapter_image_prompt_embeds=None,
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):
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"""Apply IP-Adapter attention.
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Args:
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ip_adapter_image_prompt_embeds (torch.Tensor): The image prompt embeddings.
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Shape: (batch_size, num_ip_images, seq_len, ip_embedding_len).
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"""
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residual = hidden_states
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if attn.spatial_norm is not None:
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hidden_states = attn.spatial_norm(hidden_states, temb)
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input_ndim = hidden_states.ndim
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if input_ndim == 4:
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batch_size, channel, height, width = hidden_states.shape
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hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)
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batch_size, sequence_length, _ = (
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hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
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)
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if attention_mask is not None:
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attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)
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# scaled_dot_product_attention expects attention_mask shape to be
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# (batch, heads, source_length, target_length)
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attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])
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if attn.group_norm is not None:
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hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)
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query = attn.to_q(hidden_states)
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if encoder_hidden_states is None:
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encoder_hidden_states = hidden_states
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elif attn.norm_cross:
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encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)
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key = attn.to_k(encoder_hidden_states)
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value = attn.to_v(encoder_hidden_states)
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inner_dim = key.shape[-1]
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head_dim = inner_dim // attn.heads
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query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
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key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
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value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
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# the output of sdp = (batch, num_heads, seq_len, head_dim)
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# TODO: add support for attn.scale when we move to Torch 2.1
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hidden_states = F.scaled_dot_product_attention(
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query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False
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)
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hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
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hidden_states = hidden_states.to(query.dtype)
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if encoder_hidden_states is not None:
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# If encoder_hidden_states is not None, then we are doing cross-attention, not self-attention. In this case,
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# we will apply IP-Adapter conditioning. We validate the inputs for IP-Adapter conditioning here.
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assert ip_adapter_image_prompt_embeds is not None
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assert len(ip_adapter_image_prompt_embeds) == len(self._weights)
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for ipa_embed, ipa_weights, scale in zip(ip_adapter_image_prompt_embeds, self._weights, self._scales, strict=True):
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# The batch dimensions should match.
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assert ipa_embed.shape[0] == encoder_hidden_states.shape[0]
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# The token_len dimensions should match.
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assert ipa_embed.shape[-1] == encoder_hidden_states.shape[-1]
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ip_hidden_states = ipa_embed
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# Expected ip_hidden_state shape: (batch_size, num_ip_images, ip_seq_len, ip_image_embedding)
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ip_key = ipa_weights.to_k_ip(ip_hidden_states)
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ip_value = ipa_weights.to_v_ip(ip_hidden_states)
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# Expected ip_key and ip_value shape: (batch_size, num_ip_images, ip_seq_len, head_dim * num_heads)
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ip_key = ip_key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
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ip_value = ip_value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
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# Expected ip_key and ip_value shape: (batch_size, num_heads, num_ip_images * ip_seq_len, head_dim)
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# TODO: add support for attn.scale when we move to Torch 2.1
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ip_hidden_states = F.scaled_dot_product_attention(
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query, ip_key, ip_value, attn_mask=None, dropout_p=0.0, is_causal=False
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)
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# Expected ip_hidden_states shape: (batch_size, num_heads, query_seq_len, head_dim)
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ip_hidden_states = ip_hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
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ip_hidden_states = ip_hidden_states.to(query.dtype)
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# Expected ip_hidden_states shape: (batch_size, query_seq_len, num_heads * head_dim)
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hidden_states = hidden_states + scale * ip_hidden_states
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# linear proj
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hidden_states = attn.to_out[0](hidden_states)
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# dropout
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hidden_states = attn.to_out[1](hidden_states)
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if input_ndim == 4:
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hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)
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if attn.residual_connection:
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hidden_states = hidden_states + residual
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hidden_states = hidden_states / attn.rescale_output_factor
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return hidden_states
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