Tensorflow2.* 机器学习基础知识篇：

  1. 对服装图像进行分类
  2. 使用Tensorflow Hub对未处理的电影评论数据集IMDB进行分类
  3. Keras 机器学习基础知识之对预处理的电影评论文本分类
  4. Tensorflow2.*教程之使用Auto MPG数据集构建回归模型预测燃油率

Tensorflow2.* 加载和预处理数据篇:

  1. Tensorflow2.* 加载和预处理数据之用 tf.data 加载 CSV 数据

本次课程介绍使用tf.data.Dataset加载Numpy数据，使用的数据集为Mnist手写识别体数据集。

Mnist数据集

0~9的手写体图片，该数据默认已经将数据分成训练集和测试集。训练集有60000张图片，测试集有10000张图片。

导入必要库

import tensorflow as tf
from tensorflow import keras
import numpy as np
import matplotlib.pyplot as plt
print(tf.__version__)

下载数据文件

DATA_URL = "https://storage.googleapis.com/tensorflow/tf-keras-datasets/mnist.npz"
path = keras.utils.get_file("mnist.npz",origin=DATA_URL)# 解析npz数据文件为numpy格式的数据
with np.load(path) as data:train_data = data['x_train']train_labels = data['y_train']test_data = data['x_test']test_labels = data['y_test']

使用tf.data.Dataset加载numpy数据

我们将图像数据数组和相应的标签数组，作为元组传递给 tf.data.Dataset.from_tensor_slices 以创建 tf.data.Dataset 。

# 使用tf.data加载numpy数据
train_dataset = tf.data.Dataset.from_tensor_slices((train_data,train_labels))
test_dataset = tf.data.Dataset.from_tensor_slices((test_data,test_labels))

Shuffle和批次化数据进行训练前准备

BATCH_SIZE = 64
SHUFFLE_BUFFER_SIZE = 100train_dataset = train_dataset.shuffle(SHUFFLE_BUFFER_SIZE).batch(BATCH_SIZE)
test_dataset = test_dataset.batch(BATCH_SIZE)

模型构建及训练

model = tf.keras.Sequential([tf.keras.layers.Flatten(input_shape=(28, 28)),tf.keras.layers.Dense(128, activation='relu'),tf.keras.layers.Dense(10, activation='softmax')
])model.compile(optimizer=tf.keras.optimizers.RMSprop(),loss=tf.keras.losses.SparseCategoricalCrossentropy(),metrics=[tf.keras.metrics.SparseCategoricalAccuracy()])model.fit(train_dataset,epochs=10)

Train for 938 steps
Epoch 1/10

1/938 [..............................] - ETA: 11:24 - loss: 111.1329 - sparse_categorical_accuracy: 0.1406
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938/938 [==============================] - 3s 3ms/step - loss: 2.7024 - sparse_categorical_accuracy: 0.8735
Epoch 2/10

1/938 [..............................] - ETA: 14s - loss: 0.5318 - sparse_categorical_accuracy: 0.9219
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938/938 [==============================] - 2s 3ms/step - loss: 0.4945 - sparse_categorical_accuracy: 0.9258
Epoch 3/10

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938/938 [==============================] - 3s 3ms/step - loss: 0.3855 - sparse_categorical_accuracy: 0.9441
Epoch 4/10

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938/938 [==============================] - 2s 3ms/step - loss: 0.3288 - sparse_categorical_accuracy: 0.9528
Epoch 5/10

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938/938 [==============================] - 2s 3ms/step - loss: 0.3096 - sparse_categorical_accuracy: 0.9582
Epoch 6/10

1/938 [..............................] - ETA: 13s - loss: 0.0905 - sparse_categorical_accuracy: 0.9688
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938/938 [==============================] - 3s 3ms/step - loss: 0.2942 - sparse_categorical_accuracy: 0.9622
Epoch 7/10

1/938 [..............................] - ETA: 14s - loss: 0.2891 - sparse_categorical_accuracy: 0.9531
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938/938 [==============================] - 2s 3ms/step - loss: 0.2671 - sparse_categorical_accuracy: 0.9661
Epoch 8/10

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938/938 [==============================] - 3s 3ms/step - loss: 0.2250 - sparse_categorical_accuracy: 0.9690
Epoch 9/10

1/938 [..............................] - ETA: 14s - loss: 0.5676 - sparse_categorical_accuracy: 0.9688
 19/938 [..............................] - ETA: 3s - loss: 0.3787 - sparse_categorical_accuracy: 0.9704 
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879/938 [===========================>..] - ETA: 0s - loss: 0.2405 - sparse_categorical_accuracy: 0.9699
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919/938 [============================>.] - ETA: 0s - loss: 0.2380 - sparse_categorical_accuracy: 0.9702
938/938 [==============================] - 2s 3ms/step - loss: 0.2385 - sparse_categorical_accuracy: 0.9703
Epoch 10/10

1/938 [..............................] - ETA: 14s - loss: 0.0725 - sparse_categorical_accuracy: 0.9844
 20/938 [..............................] - ETA: 3s - loss: 0.3122 - sparse_categorical_accuracy: 0.9680 
 40/938 [>.............................] - ETA: 2s - loss: 0.2266 - sparse_categorical_accuracy: 0.9727
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803/938 [========================>.....] - ETA: 0s - loss: 0.2327 - sparse_categorical_accuracy: 0.9726
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863/938 [==========================>...] - ETA: 0s - loss: 0.2303 - sparse_categorical_accuracy: 0.9727
883/938 [===========================>..] - ETA: 0s - loss: 0.2281 - sparse_categorical_accuracy: 0.9728
902/938 [===========================>..] - ETA: 0s - loss: 0.2261 - sparse_categorical_accuracy: 0.9730
922/938 [============================>.] - ETA: 0s - loss: 0.2235 - sparse_categorical_accuracy: 0.9732
938/938 [==============================] - 3s 3ms/step - loss: 0.2235 - sparse_categorical_accuracy: 0.9733

模型评估

model.evaluate(test_dataset)

1/157 [..............................] - ETA: 21s - loss: 2.3587e-04 - sparse_categorical_accuracy: 1.0000
 34/157 [=====>........................] - ETA: 0s - loss: 0.7066 - sparse_categorical_accuracy: 0.9453     
 69/157 [============>.................] - ETA: 0s - loss: 0.8308 - sparse_categorical_accuracy: 0.9443
 81/157 [==============>...............] - ETA: 0s - loss: 0.8148 - sparse_categorical_accuracy: 0.9441
 89/157 [================>.............] - ETA: 0s - loss: 0.7783 - sparse_categorical_accuracy: 0.9473
110/157 [====================>.........] - ETA: 0s - loss: 0.6985 - sparse_categorical_accuracy: 0.9540
141/157 [=========================>....] - ETA: 0s - loss: 0.5986 - sparse_categorical_accuracy: 0.9580
157/157 [==============================] - 0s 3ms/step - loss: 0.5758 - sparse_categorical_accuracy: 0.9590
[0.5758481910577826, 0.959]

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