| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| """ |
| Compile Keras Models |
| ===================== |
| **Author**: `Yuwei Hu <https://Huyuwei.github.io/>`_ |
| |
| This article is an introductory tutorial to deploy keras models with Relay. |
| |
| For us to begin with, keras should be installed. |
| Tensorflow is also required since it's used as the default backend of keras. |
| |
| A quick solution is to install via pip |
| |
| .. code-block:: bash |
| |
| pip install -U keras --user |
| pip install -U tensorflow --user |
| |
| or please refer to official site |
| https://keras.io/#installation |
| """ |
| import tvm |
| from tvm import te |
| import tvm.relay as relay |
| from tvm.contrib.download import download_testdata |
| import keras |
| import numpy as np |
| |
| ###################################################################### |
| # Load pretrained keras model |
| # ---------------------------- |
| # We load a pretrained resnet-50 classification model provided by keras. |
| weights_url = "".join( |
| [ |
| "https://github.com/fchollet/deep-learning-models/releases/", |
| "download/v0.2/resnet50_weights_tf_dim_ordering_tf_kernels.h5", |
| ] |
| ) |
| weights_file = "resnet50_weights.h5" |
| weights_path = download_testdata(weights_url, weights_file, module="keras") |
| keras_resnet50 = keras.applications.resnet50.ResNet50( |
| include_top=True, weights=None, input_shape=(224, 224, 3), classes=1000 |
| ) |
| keras_resnet50.load_weights(weights_path) |
| |
| ###################################################################### |
| # Load a test image |
| # ------------------ |
| # A single cat dominates the examples! |
| from PIL import Image |
| from matplotlib import pyplot as plt |
| from keras.applications.resnet50 import preprocess_input |
| |
| img_url = "https://github.com/dmlc/mxnet.js/blob/master/data/cat.png?raw=true" |
| img_path = download_testdata(img_url, "cat.png", module="data") |
| img = Image.open(img_path).resize((224, 224)) |
| plt.imshow(img) |
| plt.show() |
| # input preprocess |
| data = np.array(img)[np.newaxis, :].astype("float32") |
| data = preprocess_input(data).transpose([0, 3, 1, 2]) |
| print("input_1", data.shape) |
| |
| ###################################################################### |
| # Compile the model with Relay |
| # ---------------------------- |
| # convert the keras model(NHWC layout) to Relay format(NCHW layout). |
| shape_dict = {"input_1": data.shape} |
| mod, params = relay.frontend.from_keras(keras_resnet50, shape_dict) |
| # compile the model |
| target = "cuda" |
| ctx = tvm.gpu(0) |
| with tvm.transform.PassContext(opt_level=3): |
| executor = relay.build_module.create_executor("graph", mod, ctx, target) |
| |
| ###################################################################### |
| # Execute on TVM |
| # --------------- |
| dtype = "float32" |
| tvm_out = executor.evaluate()(tvm.nd.array(data.astype(dtype)), **params) |
| top1_tvm = np.argmax(tvm_out.asnumpy()[0]) |
| |
| ##################################################################### |
| # Look up synset name |
| # ------------------- |
| # Look up prediction top 1 index in 1000 class synset. |
| 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 = eval(f.read()) |
| print("Relay top-1 id: {}, class name: {}".format(top1_tvm, synset[top1_tvm])) |
| # confirm correctness with keras output |
| keras_out = keras_resnet50.predict(data.transpose([0, 2, 3, 1])) |
| top1_keras = np.argmax(keras_out) |
| print("Keras top-1 id: {}, class name: {}".format(top1_keras, synset[top1_keras])) |