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编译 PaddlePaddle 模型

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单击 此处 下载完整的示例代码

作者Ziyuan Ma

本文介绍如何用 Relay 部署 PaddlePaddle 模型,首先安装 PaddlePaddle(版本>=2.1.3),可通过 pip 快速安装:

pip install paddlepaddle -i https://mirror.baidu.com/pypi/simple

或参考官方网站:https://www.paddlepaddle.org.cn/install/quick?docurl=/documentation/docs/zh/install/pip/linux-pip.html

import tarfile
import paddle
import numpy as np
import tvm
from tvm import relay
from tvm.contrib.download import download_testdata

输出结果:

/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:36: DeprecationWarning: NEAREST is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.NEAREST or Dither.NONE instead.
'nearest': Image.NEAREST,
/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:37: DeprecationWarning: BILINEAR is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BILINEAR instead.
'bilinear': Image.BILINEAR,
/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:38: DeprecationWarning: BICUBIC is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BICUBIC instead.
'bicubic': Image.BICUBIC,
/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:39: DeprecationWarning: BOX is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BOX instead.
'box': Image.BOX,
/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:40: DeprecationWarning: LANCZOS is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.LANCZOS instead.
'lanczos': Image.LANCZOS,
/usr/local/lib/python3.7/dist-packages/paddle/vision/transforms/functional_pil.py:41: DeprecationWarning: HAMMING is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.HAMMING instead.
'hamming': Image.HAMMING

加载预训练的 ResNet50 模型

加载 PaddlePaddle 提供的 ResNet50 预训练模型:

url = "https://bj.bcebos.com/x2paddle/models/paddle_resnet50.tar"
model_path = download_testdata(url, "paddle_resnet50.tar", module="model")

with tarfile.open(model_path) as tar:
names = tar.getnames()
for name in names:
tar.extract(name, "./")

model = paddle.jit.load("./paddle_resnet50/model")

输出结果:

/usr/local/lib/python3.7/dist-packages/paddle/fluid/backward.py:1666: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
return list(x) if isinstance(x, collections.Sequence) else [x]

加载测试图像

还是用猫的图像:

from PIL import Image
import paddle.vision.transforms as T

transforms = T.Compose(
[
T.Resize((256, 256)),
T.CenterCrop(224),
T.ToTensor(),
T.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
]
)

img_url = "https://github.com/dmlc/mxnet.js/blob/main/data/cat.png?raw=true"
img_path = download_testdata(img_url, "cat.png", module="data")
img = Image.open(img_path).resize((224, 224))

img = transforms(img)
img = np.expand_dims(img, axis=0)

使用 Relay 编译模型

target = "llvm"
shape_dict = {"inputs": img.shape}
mod, params = relay.frontend.from_paddle(model, shape_dict)

with tvm.transform.PassContext(opt_level=3):
executor = relay.build_module.create_executor(
"graph", mod, tvm.cpu(0), target, params
).evaluate()

输出结果:

/workspace/python/tvm/driver/build_module.py:268: UserWarning: target_host parameter is going to be deprecated. Please pass in tvm.target.Target(target, host=target_host) instead.
"target_host parameter is going to be deprecated. "

在 TVM 上执行

dtype = "float32"
tvm_output = executor(tvm.nd.array(img.astype(dtype))).numpy()

查找分类集名称

在 1000 个类的分类集中,查找分数最高的第一个:

synset_url = "".join(
[
"https://gist.githubusercontent.com/zhreshold/",
"4d0b62f3d01426887599d4f7ede23ee5/raw/",
"596b27d23537e5a1b5751d2b0481ef172f58b539/",
"imagenet1000_clsid_to_human.txt",
]
)
synset_name = "imagenet1000_clsid_to_human.txt"
synset_path = download_testdata(synset_url, synset_name, module="data")
with open(synset_path) as f:
synset = f.readlines()

top1 = np.argmax(tvm_output[0])
print(f"TVM prediction top-1 id: {top1}, class name: {synset[top1]}")

输出结果:

TVM prediction top-1 id: 282, class name:  282: 'tiger cat',

下载 Python 源代码:from_paddle.py

下载 Jupyter Notebook:from_paddle.ipynb