Meet error when enabling xformers on windows and doing loss backward

Describe the bug

Get error when I enable xformers of UNet and try to do backward:

Traceback (most recent call last):
  File "f:/diffusers-test/vae_expr.py", line 66, in <module>
    loss.backward()
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\_tensor.py", line 396, in backward
    torch.autograd.backward(self, gradient, retain_graph, create_graph, inputs=inputs)
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\autograd\__init__.py", line 175, in backward
    allow_unreachable=True, accumulate_grad=True)  # Calls into the C++ engine to run the backward pass
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\autograd\function.py", line 253, in apply   
    return user_fn(self, *args)
  File "f:\xformers\xformers\ops\memory_efficient_attention.py", line 414, in backward
    causal=ctx.causal,
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\_ops.py", line 143, in __call__
    return self._op(*args, **kwargs or {})
RuntimeError: p.gQ_strideM() == grad_q.stride(1) INTERNAL ASSERT FAILED at "F:\\xformers\\xformers\\components\\attention\\csrc\\cuda\\mem_eff_attention\\attention_backward_generic.cu":181, please report a bug to PyTorch.

Reproduction

import argparse
import logging
import math
import os
import random
from pathlib import Path
from typing import Iterable, Optional

import numpy as np
import torch
import torch.nn.functional as F
import torch.utils.checkpoint
from diffusers import AutoencoderKL, DDPMScheduler, PNDMScheduler, StableDiffusionPipeline, UNet2DConditionModel
from diffusers.optimization import get_scheduler
from diffusers.pipelines.stable_diffusion import StableDiffusionSafetyChecker
from torchvision import transforms
from tqdm.auto import tqdm
from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer

pretrained_model_name_or_path = r'F:\diffusers-weight'
# Load models and create wrapper for stable diffusion
tokenizer = CLIPTokenizer.from_pretrained(pretrained_model_name_or_path, subfolder="tokenizer")
text_encoder = CLIPTextModel.from_pretrained(pretrained_model_name_or_path, subfolder="text_encoder")
vae = AutoencoderKL.from_pretrained(pretrained_model_name_or_path, subfolder="vae")
unet = UNet2DConditionModel.from_pretrained(pretrained_model_name_or_path, subfolder="unet")
noise_scheduler = DDPMScheduler.from_config(pretrained_model_name_or_path, subfolder="scheduler")

# Freeze vae and text_encoder
vae.requires_grad_(False)
text_encoder.requires_grad_(False)


weight_dtype = torch.bfloat16
# Move text_encode and vae to gpu.
# For mixed precision training we cast the text_encoder and vae weights to half-precision
# as these models are only used for inference, keeping weights in full precision is not required.
text_encoder.to('cuda', dtype=weight_dtype)
vae.to('cuda', dtype=weight_dtype)
unet.to('cuda', dtype=weight_dtype)
unet.set_use_memory_efficient_attention_xformers(True)

                # Convert images to latent space
images = torch.randn(1,3,512,512).to('cuda', dtype=weight_dtype)
latents = vae.encode(images).latent_dist.sample()
latents = latents * 0.18215
# Convert images to latent space
# Sample noise that we'll add to the latents
noise = torch.randn_like(latents)
bsz = latents.shape[0]
# Sample a random timestep for each image
timesteps = torch.randint(0, noise_scheduler.num_train_timesteps, (bsz,), device=latents.device)
timesteps = timesteps.long()
# Add noise to the latents according to the noise magnitude at each timestep
# (this is the forward diffusion process)
noisy_latents = noise_scheduler.add_noise(latents, noise, timesteps)
# Get the text embedding for conditioning
inputs = tokenizer('Terwt dsfs gsdgs sg"', max_length=tokenizer.model_max_length, padding="do_not_pad", truncation=True)
input_ids = [inputs["input_ids"]]
padded_tokens = tokenizer.pad({"input_ids": input_ids}, padding=True, return_tensors="pt")
input_ids = padded_tokens.input_ids.to('cuda', dtype=torch.int)
encoder_hidden_states = text_encoder(input_ids)[0]

# Predict the noise residual and compute loss
noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
loss = F.mse_loss(noise_pred.float(), noise.float(), reduction="mean")
loss.backward()

Logs

Traceback (most recent call last):
  File "f:/diffusers-test/vae_expr.py", line 66, in <module>
    loss.backward()
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\_tensor.py", line 396, in backward
    torch.autograd.backward(self, gradient, retain_graph, create_graph, inputs=inputs)
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\autograd\__init__.py", line 175, in backward
    allow_unreachable=True, accumulate_grad=True)  # Calls into the C++ engine to run the backward pass
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\autograd\function.py", line 253, in apply   
    return user_fn(self, *args)
  File "f:\xformers\xformers\ops\memory_efficient_attention.py", line 414, in backward
    causal=ctx.causal,
  File "C:\Users\uuu\.virtualenvs\stable-diffusion\lib\site-packages\torch\_ops.py", line 143, in __call__
    return self._op(*args, **kwargs or {})
RuntimeError: p.gQ_strideM() == grad_q.stride(1) INTERNAL ASSERT FAILED at "F:\\xformers\\xformers\\components\\attention\\csrc\\cuda\\mem_eff_attention\\attention_backward_generic.cu":181, please report a bug to PyTorch.

System Info

• diffusers version: 0.7.2
• Platform: Windows-10-10.0.19041-SP0
• Python version: 3.7.7
• PyTorch version (GPU?): 1.12.0+cu113 (True)
• Huggingface_hub version: 0.10.1
• Transformers version: 4.24.0
• Using GPU in script?: Yes
• Using distributed or parallel set-up in script?: No

xformers version: efdca026381a13319be082f079c60275cc871301 https://github.com/facebookresearch/xformers/commit/efdca026381a13319be082f079c60275cc871301

[patil-suraj]

I asked some community members about their windows setup for xformers, will link it here

• https://github.com/C43H66N12O12S2/stable-diffusion-webui/releases
• https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Xformers
• for T4 and A10G https://github.com/camenduru/stable-diffusion-webui-colab/releases/tag/0.0.15
• https://anaconda.org/xformers/xformers
• https://gist.github.com/geocine/e51fcc8511c91e4e3b257a0ebee938d0

Thanks a lot @camenduru and @nitrosocke!

[patrickvonplaten]

Also cc @pcuenca, we should probably add those installs to the README of stable diffusion