tf.nn.xw_plus_b真方便好用

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_unitsweights: a 2D tensor.  Dimensions typically: in_units, out_unitsbiases: a 1D tensor.  Dimensions: out_unitsname: 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.

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