faceadapter/attention_processor.py

# modified from https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/attention_processor.py
import torch
import torch.nn as nn
import torch.nn.functional as F


class AttnProcessor(nn.Module):
    r"""
    Default processor for performing attention-related computations.
    """

    def __init__(
        self,
        hidden_size=None,
        cross_attention_dim=None,
    ):
        super().__init__()

    def __call__(
        self,
        attn,
        hidden_states,
        encoder_hidden_states=None,
        attention_mask=None,
        temb=None,
    ):
        residual = hidden_states

        if attn.spatial_norm is not None:
            hidden_states = attn.spatial_norm(hidden_states, temb)

        input_ndim = hidden_states.ndim

        if input_ndim == 4:
            batch_size, channel, height, width = hidden_states.shape
            hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)

        batch_size, sequence_length, _ = (
            hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
        )
        attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)

        if attn.group_norm is not None:
            hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)

        query = attn.to_q(hidden_states)

        if encoder_hidden_states is None:
            encoder_hidden_states = hidden_states
        elif attn.norm_cross:
            encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)

        key = attn.to_k(encoder_hidden_states)
        value = attn.to_v(encoder_hidden_states)

        query = attn.head_to_batch_dim(query)
        key = attn.head_to_batch_dim(key)
        value = attn.head_to_batch_dim(value)

        attention_probs = attn.get_attention_scores(query, key, attention_mask)
        hidden_states = torch.bmm(attention_probs, value)
        hidden_states = attn.batch_to_head_dim(hidden_states)

        # linear proj
        hidden_states = attn.to_out[0](hidden_states)
        # dropout
        hidden_states = attn.to_out[1](hidden_states)

        if input_ndim == 4:
            hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)

        if attn.residual_connection:
            hidden_states = hidden_states + residual

        hidden_states = hidden_states / attn.rescale_output_factor

        return hidden_states

class AttnProcessor2_0(torch.nn.Module):
    r"""
    Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0).
    """

    def __init__(
        self,
        hidden_size=None,
        cross_attention_dim=None,
    ):
        super().__init__()
        if not hasattr(F, "scaled_dot_product_attention"):
            raise ImportError("AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0.")

    def __call__(
        self,
        attn,
        hidden_states,
        encoder_hidden_states=None,
        attention_mask=None,
        temb=None,
    ):
        residual = hidden_states

        if attn.spatial_norm is not None:
            hidden_states = attn.spatial_norm(hidden_states, temb)

        input_ndim = hidden_states.ndim

        if input_ndim == 4:
            batch_size, channel, height, width = hidden_states.shape
            hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)

        batch_size, sequence_length, _ = (
            hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
        )

        if attention_mask is not None:
            attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)
            # scaled_dot_product_attention expects attention_mask shape to be
            # (batch, heads, source_length, target_length)
            attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])

        if attn.group_norm is not None:
            hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)

        query = attn.to_q(hidden_states)

        if encoder_hidden_states is None:
            encoder_hidden_states = hidden_states
        elif attn.norm_cross:
            encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)

        key = attn.to_k(encoder_hidden_states)
        value = attn.to_v(encoder_hidden_states)

        inner_dim = key.shape[-1]
        head_dim = inner_dim // attn.heads

        query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)

        key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
        value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)

        # the output of sdp = (batch, num_heads, seq_len, head_dim)
        # TODO: add support for attn.scale when we move to Torch 2.1
        hidden_states = F.scaled_dot_product_attention(
            query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False
        )

        hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
        hidden_states = hidden_states.to(query.dtype)

        # linear proj
        hidden_states = attn.to_out[0](hidden_states)
        # dropout
        hidden_states = attn.to_out[1](hidden_states)

        if input_ndim == 4:
            hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)

        if attn.residual_connection:
            hidden_states = hidden_states + residual

        hidden_states = hidden_states / attn.rescale_output_factor

        return hidden_states

import torch
import torch.nn as nn
import torch.nn.functional as F

from diffusers.models.lora import LoRALinearLayer



from torch.utils.checkpoint import checkpoint

class LoRAFaceAttnProcessor(nn.Module):
    r"""
    Attention processor for Face-Adapater.
    Args:
        hidden_size (`int`):
            The hidden size of the attention layer.
        cross_attention_dim (`int`):
            The number of channels in the `encoder_hidden_states`.
        scale (`float`, defaults to 1.0):
            the weight scale of image prompt.
        num_tokens (`int`, defaults to 4 when do face_adapter_plus it should be 16):
            The context length of the image features.
    """

    def __init__(self, hidden_size, cross_attention_dim=None, rank=4, network_alpha=None, lora_scale=1.0, scale=1.0, num_tokens=4):
        super().__init__()

        self.rank = rank
        self.lora_scale = lora_scale
        
        self.to_q_lora = LoRALinearLayer(hidden_size, hidden_size, rank, network_alpha)
        self.to_k_lora = LoRALinearLayer(cross_attention_dim or hidden_size, hidden_size, rank, network_alpha)
        self.to_v_lora = LoRALinearLayer(cross_attention_dim or hidden_size, hidden_size, rank, network_alpha)
        self.to_out_lora = LoRALinearLayer(hidden_size, hidden_size, rank, network_alpha)

        self.hidden_size = hidden_size
        self.cross_attention_dim = cross_attention_dim
        self.scale = scale
        self.num_tokens = num_tokens

        self.to_k_face = nn.Linear(cross_attention_dim or hidden_size, hidden_size, bias=False)
        self.to_v_face = nn.Linear(cross_attention_dim or hidden_size, hidden_size, bias=False)
        self.gradient_checkpointing=False
    def __call__(
        self,
        attn,
        hidden_states,
        encoder_hidden_states=None,
        attention_mask=None,
        temb=None,
    ):
        if self.gradient_checkpointing and self.training:
            def create_custom_forward(module, return_dict=None):
                def custom_forward(*inputs):
                    if return_dict is not None:
                        return module(*inputs, return_dict=return_dict)
                    else:
                        return module(*inputs)

                return custom_forward
            if attn.spatial_norm is not None:
                hidden_states = attn.spatial_norm(hidden_states, temb)

            input_ndim = hidden_states.ndim

            if input_ndim == 4:
                batch_size, channel, height, width = hidden_states.shape
                hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)

            batch_size, sequence_length, _ = (
                hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
            )
            attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)

            if attn.group_norm is not None:
                hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)
            query = attn.to_q(hidden_states) + self.lora_scale *torch.utils.checkpoint.checkpoint(
                    create_custom_forward(self.to_q_lora),
                    hidden_states                )
            if encoder_hidden_states is None:
                encoder_hidden_states = hidden_states
            else:
                # get encoder_hidden_states, face_hidden_states
                end_pos = encoder_hidden_states.shape[1] - self.num_tokens
                encoder_hidden_states, face_hidden_states = (
                    encoder_hidden_states[:, :end_pos, :],
                    encoder_hidden_states[:, end_pos:, :],
                )
                if attn.norm_cross:
                    encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)
            key = attn.to_k(encoder_hidden_states) + self.lora_scale * torch.utils.checkpoint.checkpoint(
                    create_custom_forward(self.to_k_lora),
                    encoder_hidden_states                )
            value = attn.to_v(encoder_hidden_states) + self.lora_scale * torch.utils.checkpoint.checkpoint(
                    create_custom_forward(self.to_v_lora),
                    encoder_hidden_states                )
            query = attn.head_to_batch_dim(query)
            key = attn.head_to_batch_dim(key)
            value = attn.head_to_batch_dim(value)

            attention_probs = attn.get_attention_scores(query, key, attention_mask)
            hidden_states = torch.bmm(attention_probs, value)
            hidden_states = attn.batch_to_head_dim(hidden_states)

            # for face-adapter
            face_key = self.to_k_face(face_hidden_states)
            face_value = self.to_v_face(face_hidden_states)

            face_key = attn.head_to_batch_dim(face_key)
            face_value = attn.head_to_batch_dim(face_value)

            face_attention_probs = attn.get_attention_scores(query, face_key, None)
            self.attn_map = face_attention_probs
            face_hidden_states = torch.bmm(face_attention_probs, face_value)
            face_hidden_states = attn.batch_to_head_dim(face_hidden_states)

            hidden_states = hidden_states + self.scale * face_hidden_states

            # linear proj
            hidden_states = attn.to_out[0](hidden_states) + self.lora_scale * self.to_out_lora(hidden_states)
            # dropout
            hidden_states = attn.to_out[1](hidden_states)

            if input_ndim == 4:
                hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)

            if attn.residual_connection:
                hidden_states = hidden_states + residual

            hidden_states = hidden_states / attn.rescale_output_factor
                       
        else:
            if attn.spatial_norm is not None:
                hidden_states = attn.spatial_norm(hidden_states, temb)

            input_ndim = hidden_states.ndim

            if input_ndim == 4:
                batch_size, channel, height, width = hidden_states.shape
                hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)

            batch_size, sequence_length, _ = (
                hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
            )
            attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)

            if attn.group_norm is not None:
                hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)

            query = attn.to_q(hidden_states) + self.lora_scale * self.to_q_lora(hidden_states)

            if encoder_hidden_states is None:
                encoder_hidden_states = hidden_states
            else:
                # get encoder_hidden_states, face_hidden_states
                end_pos = encoder_hidden_states.shape[1] - self.num_tokens
                encoder_hidden_states, face_hidden_states = (
                    encoder_hidden_states[:, :end_pos, :],
                    encoder_hidden_states[:, end_pos:, :],
                )
                if attn.norm_cross:
                    encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)

            key = attn.to_k(encoder_hidden_states) + self.lora_scale * self.to_k_lora(encoder_hidden_states)
            value = attn.to_v(encoder_hidden_states) + self.lora_scale * self.to_v_lora(encoder_hidden_states)

            query = attn.head_to_batch_dim(query)
            key = attn.head_to_batch_dim(key)
            value = attn.head_to_batch_dim(value)

            attention_probs = attn.get_attention_scores(query, key, attention_mask)
            hidden_states = torch.bmm(attention_probs, value)
            hidden_states = attn.batch_to_head_dim(hidden_states)

            # for face-adapter
            face_key = self.to_k_face(face_hidden_states)
            face_value = self.to_v_face(face_hidden_states)

            face_key = attn.head_to_batch_dim(face_key)
            face_value = attn.head_to_batch_dim(face_value)

            face_attention_probs = attn.get_attention_scores(query, face_key, None)
            self.attn_map = face_attention_probs
            face_hidden_states = torch.bmm(face_attention_probs, face_value)
            face_hidden_states = attn.batch_to_head_dim(face_hidden_states)

            hidden_states = hidden_states + self.scale * face_hidden_states

            # linear proj
            hidden_states = attn.to_out[0](hidden_states) + self.lora_scale * self.to_out_lora(hidden_states)
            # dropout
            hidden_states = attn.to_out[1](hidden_states)

            if input_ndim == 4:
                hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)

            if attn.residual_connection:
                hidden_states = hidden_states + residual

            hidden_states = hidden_states / attn.rescale_output_factor
        return hidden_states