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AI开发平台MODELARTS-模型适配:获取模型shape

时间：2025-01-03 09:38:46

AI开发平台MODELARTS 应用迁移

获取模型shape

由于在后续模型转换时需要知道待转换模型的shape信息，此处指导如何通过训练好的stable diffusion pytorch模型获取模型shape，主要有如下两种方式获取：

方式一：通过stable diffusion的pytorch模型获取模型shape。
方式二：通过查看ModelArts-Ascend代码仓库，根据每个模型的configs文件获取已知的shape大小。

下文主要介绍如何通过方式一获取模型shape。

在pipeline应用准备章节，已经下载到sd的pytorch模型（/home_host/work/runwayml/pytorch_models）。进入工作目录：
```
cd /home_host/work
```

新建Python脚本文件“parse_models_shape.py”用于获取shape。其中，model_path是指上面下载的pytorch_models的路径。

# parse_models_shape.py
import torch
import numpy as np
from diffusers import StableDiffusionPipeline

model_path = '/home_host/work/runwayml/pytorch_models'
pipeline = StableDiffusionPipeline.from_pretrained(model_path, torch_dtype=torch.float32)

# TEXT ENCODER
num_tokens = pipeline.text_encoder.config.max_position_embeddings
text_hidden_size = pipeline.text_encoder.config.hidden_size
text_input = pipeline.tokenizer(
    "A sample prompt",
    padding="max_length",
    max_length=pipeline.tokenizer.model_max_length,
    truncation=True,
    return_tensors="pt",
)
print("# TEXT ENCODER")
print(f"input_ids: {np.array(text_input.input_ids.shape).tolist()}")

# UNET
unet_in_channels = pipeline.unet.config.in_channels
unet_sample_size = pipeline.unet.config.sample_size
print("# UNET")
print(f"sample: [{2}, {unet_in_channels} {unet_sample_size} {unet_sample_size}]")
print(f"timestep: [{1}]")  # 此处应该是1，否则和后续的推理脚本不一致。
print(f"encoder_hidden_states: [{2}, {num_tokens} {text_hidden_size}]")

# VAE ENCODER
vae_encoder = pipeline.vae
vae_in_channels = vae_encoder.config.in_channels
vae_sample_size = vae_encoder.config.sample_size
print("# VAE ENCODER")
print(f"sample: [{1}, {vae_in_channels}, {vae_sample_size}, {vae_sample_size}]")

# VAE DECODER
vae_decoder = pipeline.vae
vae_latent_channels = vae_decoder.config.latent_channels
vae_out_channels = vae_decoder.config.out_channels
print("# VAE DECODER")
print(f"latent_sample: [{1}, {vae_latent_channels}, {unet_sample_size}, {unet_sample_size}]")

# SAFETY CHECKER
safety_checker = pipeline.safety_checker
clip_num_channels = safety_checker.config.vision_config.num_channels
clip_image_size = safety_checker.config.vision_config.image_size
print("# SAFETY CHECKER")
print(f"clip_input: [{1}, {clip_num_channels}, {clip_image_size}, {clip_image_size}]")
print(f"images: [{1}, {vae_sample_size}, {vae_sample_size}, {vae_out_channels}]")