tf.reduce_max

功能：根据tensor的维度计算最大值。

input_tensor: The tensor to reduce.

axis: The dimensions to reduce. If `None` (the default),reduces all dimensions. Must be in the range `[-rank(input_tensor), rank(input_tensor))`.

keepdims: If true, retains reduced dimensions with length 1.

name: A name for the operation (optional).

reduction_indices: The old (deprecated) name for axis.

keep_dims: Deprecated alias for `keepdims`.

Returns:The reduced tensor.