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# tf.compat.v1.reverse_sequence

Reverses variable length slices. (deprecated arguments) (deprecated arguments)

This op first slices `input` along the dimension `batch_axis`, and for each slice `i`, reverses the first `seq_lengths[i]` elements along the dimension `seq_axis`.

The elements of `seq_lengths` must obey ```seq_lengths[i] <= input.dims[seq_dim]```, and `seq_lengths` must be a vector of length `input.dims[batch_dim]`.

The output slice `i` along dimension `batch_axis` is then given by input slice `i`, with the first `seq_lengths[i]` slices along dimension `seq_axis` reversed.

#### Example usage:

````seq_lengths = [7, 2, 3, 5]`
`input = [[1, 2, 3, 4, 5, 0, 0, 0], [1, 2, 0, 0, 0, 0, 0, 0],`
`         [1, 2, 3, 4, 0, 0, 0, 0], [1, 2, 3, 4, 5, 6, 7, 8]]`
`output = tf.reverse_sequence(input, seq_lengths, seq_axis=1, batch_axis=0)`
`output`
`<tf.Tensor: shape=(4, 8), dtype=int32, numpy=`
`array([[0, 0, 5, 4, 3, 2, 1, 0],`
`       [2, 1, 0, 0, 0, 0, 0, 0],`
`       [3, 2, 1, 4, 0, 0, 0, 0],`
`       [5, 4, 3, 2, 1, 6, 7, 8]], dtype=int32)>`
```

`input`: A `Tensor`. The input to reverse. `seq_lengths`: A `Tensor`. Must be one of the following types: `int32`, `int64`. 1-D with length `input.dims(batch_dim)` and ```max(seq_lengths) <= input.dims(seq_dim)``` `seq_axis`: An `int`. The dimension which is partially reversed. `batch_axis`: An optional `int`. Defaults to `0`. The dimension along which reversal is performed. `name`: A name for the operation (optional).

A Tensor. Has the same type as input.

[{ "type": "thumb-down", "id": "missingTheInformationINeed", "label":"Missing the information I need" },{ "type": "thumb-down", "id": "tooComplicatedTooManySteps", "label":"Too complicated / too many steps" },{ "type": "thumb-down", "id": "outOfDate", "label":"Out of date" },{ "type": "thumb-down", "id": "samplesCodeIssue", "label":"Samples / code issue" },{ "type": "thumb-down", "id": "otherDown", "label":"Other" }]
[{ "type": "thumb-up", "id": "easyToUnderstand", "label":"Easy to understand" },{ "type": "thumb-up", "id": "solvedMyProblem", "label":"Solved my problem" },{ "type": "thumb-up", "id": "otherUp", "label":"Other" }]