# tf.compat.v1.reduce_logsumexp

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v2.13.1/tensorflow/python/ops/math_ops.py#L3412-L3466) |

Computes log(sum(exp(elements across dimensions of a tensor))). (deprecated arguments)

#### View aliases


**Compat aliases for migration**

See
[Migration guide](https://www.tensorflow.org/guide/migrate) for
more details.

[`tf.compat.v1.math.reduce_logsumexp`](https://www.tensorflow.org/api_docs/python/tf/compat/v1/reduce_logsumexp)

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    tf.compat.v1.reduce_logsumexp(
        input_tensor,
        axis=None,
        keepdims=None,
        name=None,
        reduction_indices=None,
        keep_dims=None
    )

> [!WARNING]
> **Deprecated:** SOME ARGUMENTS ARE DEPRECATED: `(keep_dims)`. They will be removed in a future version. Instructions for updating: keep_dims is deprecated, use keepdims instead

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` has no entries, all dimensions are reduced, and a
tensor with a single element is returned.

This function is more numerically stable than log(sum(exp(input))). It avoids
overflows caused by taking the exp of large inputs and underflows caused by
taking the log of small inputs.

#### For example:

    x = tf.constant([[0., 0., 0.], [0., 0., 0.]])
    tf.reduce_logsumexp(x)  # log(6)
    tf.reduce_logsumexp(x, 0)  # [log(2), log(2), log(2)]
    tf.reduce_logsumexp(x, 1)  # [log(3), log(3)]
    tf.reduce_logsumexp(x, 1, keepdims=True)  # [[log(3)], [log(3)]]
    tf.reduce_logsumexp(x, [0, 1])  # log(6)

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| ## Args ||
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| `input_tensor` | The tensor to reduce. Should have 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). |
| `reduction_indices` | The old (deprecated) name for axis. |
| `keep_dims` | Deprecated alias for `keepdims`. |

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| ## Returns ||
|---|---|
| The reduced tensor. ||

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