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# tf.math.reduce_max

Computes `tf.math.maximum` of elements across dimensions of a tensor.

### Used in the notebooks

This is the reduction operation for the elementwise `tf.math.maximum` op.

Reduces `input_tensor` along the dimensions given in `axis`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each of the entries in `axis`, which must be unique. If `keepdims` is true, the reduced dimensions are retained with length 1.

If `axis` is None, all dimensions are reduced, and a tensor with a single element is returned.

#### Usage example:

````x = tf.constant([5, 1, 2, 4])`
`tf.reduce_max(x)`
`<tf.Tensor: shape=(), dtype=int32, numpy=5>`
`x = tf.constant([-5, -1, -2, -4])`
`tf.reduce_max(x)`
`<tf.Tensor: shape=(), dtype=int32, numpy=-1>`
`x = tf.constant([4, float('nan')])`
`tf.reduce_max(x)`
`<tf.Tensor: shape=(), dtype=float32, numpy=nan>`
`x = tf.constant([float('nan'), float('nan')])`
`tf.reduce_max(x)`
`<tf.Tensor: shape=(), dtype=float32, numpy=nan>`
`x = tf.constant([float('-inf'), float('inf')])`
`tf.reduce_max(x)`
`<tf.Tensor: shape=(), dtype=float32, numpy=inf>`
```

See the numpy docs for `np.amax` and `np.nanmax` behavior.

`input_tensor` The tensor to reduce. Should have real numeric type.
`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).

The reduced tensor.

[{ "type": "thumb-down", "id": "missingTheInformationINeed", "label":"没有我需要的信息" },{ "type": "thumb-down", "id": "tooComplicatedTooManySteps", "label":"太复杂/步骤太多" },{ "type": "thumb-down", "id": "outOfDate", "label":"内容需要更新" },{ "type": "thumb-down", "id": "samplesCodeIssue", "label":"Samples / code issue" },{ "type": "thumb-down", "id": "otherDown", "label":"其他" }]
[{ "type": "thumb-up", "id": "easyToUnderstand", "label":"易于理解" },{ "type": "thumb-up", "id": "solvedMyProblem", "label":"解决了我的问题" },{ "type": "thumb-up", "id": "otherUp", "label":"其他" }]