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Gather slices from params axis `axis`

according to indices.

tf.gather( params, indices, validate_indices=None, axis=None, batch_dims=0, name=None )

Gather slices from params axis `axis`

according to `indices`

. `indices`

must be an integer tensor of any dimension (usually 0-D or 1-D).

For 0-D (scalar) `indices`

:

$$\begin{align*} output[p_0, ..., p_{axis-1}, && &&& p_{axis + 1}, ..., p_{N-1}] = \\ params[p_0, ..., p_{axis-1}, && indices, &&& p_{axis + 1}, ..., p_{N-1}] \end{align*}$$

Where *N* = `ndims(params)`

.

For 1-D (vector) `indices`

with `batch_dims=0`

:

$$\begin{align*} output[p_0, ..., p_{axis-1}, && &i, &&p_{axis + 1}, ..., p_{N-1}] =\\ params[p_0, ..., p_{axis-1}, && indices[&i], &&p_{axis + 1}, ..., p_{N-1}] \end{align*}$$

In the general case, produces an output tensor where:

$$\begin{align*} output[p_0, &..., p_{axis-1}, & &i_{B}, ..., i_{M-1}, & p_{axis + 1}, &..., p_{N-1}] = \\ params[p_0, &..., p_{axis-1}, & indices[p_0, ..., p_{B-1}, &i_{B}, ..., i_{M-1}], & p_{axis + 1}, &..., p_{N-1}] \end{align*}$$

Where *N* = `ndims(params)`

, *M* = `ndims(indices)`

, and *B* = `batch_dims`

. Note that `params.shape[:batch_dims]`

must be identical to `indices.shape[:batch_dims]`

.

The shape of the output tensor is:

`output.shape = params.shape[:axis] + indices.shape[batch_dims:] + params.shape[axis + 1:]`

.

Note that on CPU, if an out of bound index is found, an error is returned. On GPU, if an out of bound index is found, a 0 is stored in the corresponding output value.

See also `tf.gather_nd`

.

Args | |
---|---|

`params` | The `Tensor` from which to gather values. Must be at least rank `axis + 1` . |

`indices` | The index `Tensor` . Must be one of the following types: `int32` , `int64` . Must be in range `[0, params.shape[axis])` . |

`validate_indices` | Deprecated, does nothing. |

`axis` | A `Tensor` . Must be one of the following types: `int32` , `int64` . The `axis` in `params` to gather `indices` from. Must be greater than or equal to `batch_dims` . Defaults to the first non-batch dimension. Supports negative indexes. |

`batch_dims` | An `integer` . The number of batch dimensions. Must be less than or equal to `rank(indices)` . |

`name` | A name for the operation (optional). |

Returns | |
---|---|

A `Tensor` . Has the same type as `params` . |

© 2020 The TensorFlow Authors. All rights reserved.

Licensed under the Creative Commons Attribution License 3.0.

Code samples licensed under the Apache 2.0 License.

https://www.tensorflow.org/versions/r2.3/api_docs/python/tf/gather