TensorFlow教程batch_xs，batch_ys = mnist.train.next_batch(100)的next_batch来自何处?

问题描述

我正在尝试TensorFlow教程，但不知道此行中的next_batch来自何处?

I am trying out the TensorFlow tutorial and don't understand where does next_batch in this line come from?

 batch_xs, batch_ys = mnist.train.next_batch(100)

我看着

from tensorflow.examples.tutorials.mnist import input_data
mnist = input_data.read_data_sets("MNIST_data/", one_hot=True)

也没有看到next_batch.

And didn't see next_batch there either.

现在，当在我自己的代码中尝试next_batch时，我会得到

Now when trying out next_batch in my own code, I am getting

AttributeError: 'numpy.ndarray' object has no attribute 'next_batch'

所以我想了解next_batch来自何处?

So I would like to understand where does next_batch come from?

推荐答案

next_batch是DataSet类的方法(请参见了解有关课程内容的更多信息.

next_batch is a method of the DataSet class (see https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/learn/python/learn/datasets/mnist.py for more information on what's in the class).

当您加载mnist数据并将其分配给变量mnist时，使用以下命令:

When you load the mnist data and assign it to the variable mnist with:

mnist = input_data.read_data_sets("MNIST_data/", one_hot=True)

查看mnist.train的类.您可以输入以下内容来查看它:

look at the class of mnist.train. You can see it by typing:

print mnist.train.__class__

您将看到以下内容:

<class 'tensorflow.contrib.learn.python.learn.datasets.mnist.Dataset'>

因为mnist.train是类DataSet的实例，所以可以使用该类的函数next_batch.有关类的更多信息，请查看文档.

Because mnist.train is an instance of class DataSet, you can use the class's function next_batch. For more information on classes, check out the documentation.

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