TensorFlow中slim包的具体用法
本次使用的TensorFlow版本是1.13.0
地址:https://github.com/tensorflow/models/tree/r1.13.0
到tensorflow-models的GitHub下载research下面的slim这个包到本地
TensorFlow中slim包的目录结构:
-- slim
|-- BUILD
|-- README.md
|-- WORKSPACE
|-- __init__.py
|-- datasets
||-- __init__.py
||-- __pycache__
|||-- __init__.cpython-37.pyc
|||-- dataset_utils.cpython-37.pyc
|||-- download_and_convert_cifar10.cpython-37.pyc
|||-- download_and_convert_flowers.cpython-37.pyc
|| `-- download_and_convert_mnist.cpython-37.pyc
||-- build_imagenet_data.py
||-- cifar10.py
||-- dataset_factory.py
||-- dataset_utils.py
||-- download_and_convert_cifar10.py
||-- download_and_convert_flowers.py
||-- download_and_convert_imagenet.sh
||-- download_and_convert_mnist.py
||-- download_imagenet.sh
||-- flowers.py
||-- imagenet.py
||-- imagenet_2012_validation_synset_labels.txt
||-- imagenet_lsvrc_2015_synsets.txt
||-- imagenet_metadata.txt
||-- mnist.py
||-- preprocess_imagenet_validation_data.py
| `-- process_bounding_boxes.py
|-- deployment
||-- __init__.py
||-- model_deploy.py
| `-- model_deploy_test.py
|-- download_and_convert_data.py # 下载相应的数据集,并将数据打包成TF-record的格式|-- eval_image_classifier.py # 测试模型分类效果|-- export_inference_graph.py
|-- export_inference_graph_test.py
|-- nets
||-- __init__.py
||-- alexnet.py
||-- alexnet_test.py
||-- cifarnet.py
||-- cyclegan.py
||-- cyclegan_test.py
||-- dcgan.py
||-- dcgan_test.py
||-- i3d.py
||-- i3d_test.py
||-- i3d_utils.py
||-- inception.py
||-- inception_resnet_v2.py
||-- inception_resnet_v2_test.py
||-- inception_utils.py
||-- inception_v1.py
||-- inception_v1_test.py
||-- inception_v2.py
||-- inception_v2_test.py
||-- inception_v3.py
||-- inception_v3_test.py
||-- inception_v4.py
||-- inception_v4_test.py
||-- lenet.py
||-- mobilenet
|||-- README.md
|||-- __init__.py
|||-- conv_blocks.py
|||-- madds_top1_accuracy.png
|||-- mnet_v1_vs_v2_pixel1_latency.png
|||-- mobilenet.py
|||-- mobilenet_example.ipynb
|||-- mobilenet_v2.py
|| `-- mobilenet_v2_test.py
||-- mobilenet_v1.md
||-- mobilenet_v1.png
||-- mobilenet_v1.py
||-- mobilenet_v1_eval.py
||-- mobilenet_v1_test.py
||-- mobilenet_v1_train.py
||-- nasnet
|||-- README.md
|||-- __init__.py
|||-- nasnet.py
|||-- nasnet_test.py
|||-- nasnet_utils.py
|||-- nasnet_utils_test.py
|||-- pnasnet.py
|| `-- pnasnet_test.py
||-- nets_factory.py
||-- nets_factory_test.py
||-- overfeat.py
||-- overfeat_test.py
||-- pix2pix.py
||-- pix2pix_test.py
||-- resnet_utils.py
||-- resnet_v1.py
||-- resnet_v1_test.py
||-- resnet_v2.py
||-- resnet_v2_test.py
||-- s3dg.py
||-- s3dg_test.py
||-- vgg.py
| `-- vgg_test.py
|-- preprocessing
||-- __init__.py
||-- cifarnet_preprocessing.py
||-- inception_preprocessing.py
||-- lenet_preprocessing.py
||-- preprocessing_factory.py
| `-- vgg_preprocessing.py
|-- scripts # gqr:存储的是相关的模型训练脚本 ||-- export_mobilenet.sh
||-- finetune_inception_resnet_v2_on_flowers.sh
||-- finetune_inception_v1_on_flowers.sh
||-- finetune_inception_v3_on_flowers.sh
||-- finetune_resnet_v1_50_on_flowers.sh
||-- train_cifarnet_on_cifar10.sh
| `-- train_lenet_on_mnist.sh
|-- setup.py
|-- slim_walkthrough.ipynb
`-- train_image_classifier.py # 训练模型的脚本
1、训练脚本文件(该文件包含数据下载打包、模型训练,模型评估流程)
scripts/finetune_resnet_v1_50_on_flowers.sh
#!/bin/bash# Copyright 2017 The TensorFlow Authors. All Rights Reserved.## Licensed 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.# ==============================================================================## This script performs the following operations:# 1. Downloads the Flowers dataset# 2. Fine-tunes a ResNetV1-50 model on the Flowers training set.# 3. Evaluates the model on the Flowers validation set.## Usage:# cd slim# ./slim/scripts/finetune_resnet_v1_50_on_flowers.shset-e
# Where the pre-trained ResNetV1-50 checkpoint is saved to.
PRETRAINED_CHECKPOINT_DIR=/tmp/checkpoints # gqr:预训练模型存放路径# Where the training (fine-tuned) checkpoint and logs will be saved to.
TRAIN_DIR=/tmp/flowers-models/resnet_v1_50
# Where the dataset is saved to.
DATASET_DIR=/tmp/flowers # gqr:数据集存放路径# Download the pre-trained checkpoint.if[ ! -d "$PRETRAINED_CHECKPOINT_DIR"]; then
mkdir ${PRETRAINED_CHECKPOINT_DIR}
fi
if[ ! -f ${PRETRAINED_CHECKPOINT_DIR}/resnet_v1_50.ckpt ]; then
wget http://download.tensorflow.org/models/resnet_v1_50_2016_08_28.tar.gz
tar -xvf resnet_v1_50_2016_08_28.tar.gz
mv resnet_v1_50.ckpt ${PRETRAINED_CHECKPOINT_DIR}/resnet_v1_50.ckpt
rm resnet_v1_50_2016_08_28.tar.gz
fi
# Download the dataset
python download_and_convert_data.py \
--dataset_name=flowers \
--dataset_dir=${DATASET_DIR}# Fine-tune only the new layers for 3000 steps.
python train_image_classifier.py \
--train_dir=${TRAIN_DIR} \
--dataset_name=flowers \
--dataset_split_name=train \
--dataset_dir=${DATASET_DIR} \
--model_name=resnet_v1_50 \
--checkpoint_path=${PRETRAINED_CHECKPOINT_DIR}/resnet_v1_50.ckpt \
--checkpoint_exclude_scopes=resnet_v1_50/logits \
--trainable_scopes=resnet_v1_50/logits \
--max_number_of_steps=3000 \
--batch_size=32 \
--learning_rate=0.01 \
--save_interval_secs=60 \
--save_summaries_secs=60 \
--log_every_n_steps=100 \
--optimizer=rmsprop \
--weight_decay=0.00004# Run evaluation.
python eval_image_classifier.py \
--checkpoint_path=${TRAIN_DIR} \
--eval_dir=${TRAIN_DIR} \
--dataset_name=flowers \
--dataset_split_name=validation \
--dataset_dir=${DATASET_DIR} \
--model_name=resnet_v1_50
# Fine-tune all the new layers for 1000 steps.
python train_image_classifier.py \
--train_dir=${TRAIN_DIR}/all \
--dataset_name=flowers \
--dataset_split_name=train \
--dataset_dir=${DATASET_DIR} \
--checkpoint_path=${TRAIN_DIR} \
--model_name=resnet_v1_50 \
--max_number_of_steps=1000 \
--batch_size=32 \
--learning_rate=0.001 \
--save_interval_secs=60 \
--save_summaries_secs=60 \
--log_every_n_steps=100 \
--optimizer=rmsprop \
--weight_decay=0.00004# Run evaluation.
python eval_image_classifier.py \
--checkpoint_path=${TRAIN_DIR}/all \
--eval_dir=${TRAIN_DIR}/all \
--dataset_name=flowers \
--dataset_split_name=validation \
--dataset_dir=${DATASET_DIR} \
--model_name=resnet_v1_50
以上文件以下载并打包flowers数据集为例会调用slim/datasets下的****download_and_convert_flowers.py
代码43行:**_NUM_VALIDATION = 350值的意思的测试数据集的数量,我们一般2,8分数据集,这里只用填写测试集的数据代码会自动吧总数据集分成2部分
代码48行:_NUM_SHARDS = 1**这个的意思是生成几个tfrecord文件,这个数量是根据你数据量来划分
代码190行:dataset_utils.download_and_uncompress_tarball(_DATA_URL, dataset_dir) 函数为下载数据集函数,如果本地已经存在数据集,可将将其注释掉
代码210行:_clean_up_temporary_files(dataset_dir) 函数为打包完毕后删除下载的数据集文件,如果需要下载的数据集可以将其注释掉
上述文件执行完毕后,会得到以下文件
3、模型训练
模型训练文件为
以下是该文件中各个模块相关内容
1、数据集相关模块:
2、设置网络模型模块
3、数据预处理模块
4、定义损失loss
5、定义优化器模块
运行训练指令:
python train_image_classifier.py \
--train_dir=./data/flowers-models/resnet_v1_50\
--dataset_name=flowers \
--dataset_split_name=train \
--dataset_dir=./data/flowers \
--model_name=resnet_v1_50 \
--checkpoint_path=./data/checkpoints/resnet_v1_50.ckpt \
--checkpoint_exclude_scopes=resnet_v1_50/logits \
--trainable_scopes=resnet_v1_50/logits \
--max_number_of_steps=3000 \
--batch_size=32 \
--learning_rate=0.01 \
--save_interval_secs=60 \
--save_summaries_secs=60 \
--log_every_n_steps=100 \
--optimizer=rmsprop \
--weight_decay=0.00004
–dataset_name=指定模板
–model_name=指定预训练模板
–dataset_dir=指定训练集目录
–checkpoint_exclude_scopes=指定忘记那几层的参数,不带进训练里面,记住提取特征的部分
–train_dir=训练参数存放地址
–trainable_scopes=设定只对那几层变量进行调整,其他层都不进行调整,不设定就会对所有层训练(所以是必须要给定的)
–learning_rate=学习率
–optimizer=优化器
–checkpoint_path:预训练模型存放地址
–max_number_of_steps=训练步数
–batch_size=一次训练所选取的样本数。 (Batch Size的大小影响模型的优化程度和速度。同时其直接影响到GPU内存的使用情况,假如你GPU内存不大,该数值最好设置小一点。)
–weight_decay=即模型中所有参数的二次正则化超参数(这个的加入就是为了防止过拟合加入正则项,weight_decay 是乘在正则项的前面,控制正则化项在损失函数中所占权重的)
注意:在模型训练前,需要下载预训练模型,
wget http://download.tensorflow.org/models/resnet_v1_50_2016_08_28.tar.gz
解压后存放在相应目录
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