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@ -4,26 +4,28 @@ from typing import Any, Optional
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import numpy as np
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import torch
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import torch.nn as nn
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from einops import rearrange
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from torch import nn
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from imaginairy.modules.attention import MemoryEfficientCrossAttention
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try:
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import xformers
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import xformers.ops
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import xformers # noqa
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import xformers.ops # noqa
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XFORMERS_IS_AVAILBLE = True
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except:
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XFORMERS_IS_AVAILBLE = False
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XFORMERS_IS_AVAILABLE = True
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except ImportError:
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XFORMERS_IS_AVAILABLE = False
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# print("No module 'xformers'. Proceeding without it.")
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def get_timestep_embedding(timesteps, embedding_dim):
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"""
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Build sinusoidal embeddings.
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This matches the implementation in Denoising Diffusion Probabilistic Models:
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From Fairseq.
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Build sinusoidal embeddings.
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This matches the implementation in tensor2tensor, but differs slightly
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from the description in Section 3.5 of "Attention Is All You Need".
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"""
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@ -271,22 +273,22 @@ def make_attn(in_channels, attn_type="vanilla", attn_kwargs=None):
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"linear",
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"none",
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], f"attn_type {attn_type} unknown"
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if XFORMERS_IS_AVAILBLE and attn_type == "vanilla":
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if XFORMERS_IS_AVAILABLE and attn_type == "vanilla":
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attn_type = "vanilla-xformers"
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# print(f"making attention of type '{attn_type}' with {in_channels} in_channels")
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if attn_type == "vanilla":
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assert attn_kwargs is None
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return AttnBlock(in_channels)
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elif attn_type == "vanilla-xformers":
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if attn_type == "vanilla-xformers":
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# print(f"building MemoryEfficientAttnBlock with {in_channels} in_channels...")
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return MemoryEfficientAttnBlock(in_channels)
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elif type == "memory-efficient-cross-attn":
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if type == "memory-efficient-cross-attn":
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attn_kwargs["query_dim"] = in_channels
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return MemoryEfficientCrossAttentionWrapper(**attn_kwargs)
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elif attn_type == "none":
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if attn_type == "none":
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return nn.Identity(in_channels)
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else:
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raise NotImplementedError()
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raise NotImplementedError()
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class Model(nn.Module):
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@ -599,7 +601,7 @@ class Decoder(nn.Module):
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tanh_out=False,
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use_linear_attn=False,
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attn_type="vanilla",
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**ignorekwargs,
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**ignore_kwargs,
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):
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super().__init__()
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if use_linear_attn:
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@ -677,6 +679,8 @@ class Decoder(nn.Module):
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block_in, out_ch, kernel_size=3, stride=1, padding=1
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)
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self.last_z_shape = None
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def forward(self, z):
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# assert z.shape[1:] == self.z_shape[1:]
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self.last_z_shape = z.shape
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@ -1003,17 +1007,16 @@ class Resize(nn.Module):
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# f"Note: {self.__class__.__name} uses learned downsampling and will ignore the fixed {mode} mode"
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# )
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raise NotImplementedError()
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assert in_channels is not None
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# no asymmetric padding in torch conv, must do it ourselves
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self.conv = torch.nn.Conv2d(
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in_channels, in_channels, kernel_size=4, stride=2, padding=1
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)
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# assert in_channels is not None
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# # no asymmetric padding in torch conv, must do it ourselves
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# self.conv = torch.nn.Conv2d(
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# in_channels, in_channels, kernel_size=4, stride=2, padding=1
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# )
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def forward(self, x, scale_factor=1.0):
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if scale_factor == 1.0:
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return x
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else:
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x = torch.nn.functional.interpolate(
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x, mode=self.mode, align_corners=False, scale_factor=scale_factor
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)
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x = torch.nn.functional.interpolate(
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x, mode=self.mode, align_corners=False, scale_factor=scale_factor
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)
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return x
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Bryce
1 year ago
committed by