望文生义就知道了这个函数什么用，x*w+b，就是这么回事。
>>> help(tf.nn.xw_plus_b)
Help on function xw_plus_b in module tensorflow.python.ops.nn_ops:
xw_plus_b(x, weights, biases, name=None)
Computes matmul(x, weights) + biases.
Args:
x: a 2D tensor. Dimensions typically: batch, in_units
weights: a 2D tensor. Dimensions typically: in_units, out_units
biases: a 1D tensor. Dimensions: out_units
name: A name for the operation (optional). If not specified
"xw_plus_b" is used.
Returns:
A 2-D Tensor computing matmul(x, weights) + biases.
Dimensions typically: batch, out_units.For Video Recommendation in Deep learning QQ Group 277356808
For Speech, Image, Video in deep learning QQ Group 868373192
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