注解

This chapter shows how to implement various SVM methods with TensorFlow. We first create a linear SVM and also show how it can be used for regression. We then introduce kernels (RBF Gaussian kernel) and show how to use it to split up non-linear data. We finish with a multi-dimensional implementation of non-linear SVMs to work with multiple classes.

引言¶

We introduce the concept of SVMs and how we will go about implementing them in the TensorFlow framework.

线性支持向量机¶

We create a linear SVM to separate I. setosa based on sepal length and pedal width in the Iris data set.

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回归线性回归¶

The heart of SVMs is separating classes with a line. We change tweek the algorithm slightly to perform SVM regression.

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TensorFlow中的核¶

In order to extend SVMs into non-linear data, we explain and show how to implement different kernels in TensorFlow.

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非线性支持向量机¶

We use the Gaussian kernel (RBF) to separate non-linear classes.

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多类支持向量机¶

SVMs are inherently binary predictors. We show how to extend them in a one-vs-all strategy in TensorFlow.

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本章学习模块¶

tensorflow.zeros¶

Creates a tensor with all elements set to zero.

This operation returns a tensor of type dtype with shape shape and all elements set to zero.

>>> tf.zeros([3, 4], tf.int32)
<tf.Tensor: shape=(3, 4), dtype=int32, numpy=
array([[0, 0, 0, 0],
       [0, 0, 0, 0],
       [0, 0, 0, 0]], dtype=int32)>

param shape:	A list of integers, a tuple of integers, or a 1-D Tensor of type int32.
param dtype:	The DType of an element in the resulting Tensor.
param name:	Optional string. A name for the operation.
returns:	A Tensor with all elements set to zero.

tensorflow.ones¶

Creates a tensor with all elements set to one (1).

See also tf.ones_like.

This operation returns a tensor of type dtype with shape shape and all elements set to one.

>>> tf.ones([3, 4], tf.int32)
<tf.Tensor: shape=(3, 4), dtype=int32, numpy=
array([[1, 1, 1, 1],
       [1, 1, 1, 1],
       [1, 1, 1, 1]], dtype=int32)>

param shape:	A list of integers, a tuple of integers, or a 1-D Tensor of type int32.
param dtype:	Optional DType of an element in the resulting Tensor. Default is tf.float32.
param name:	Optional string. A name for the operation.
returns:	A Tensor with all elements set to one (1).