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enuSpace-tensorflow Manual

Substr

tensorflow C++ API

tensorflow::ops::Substr

Return substrings from Tensor of strings.

Summary

For each string in the input Tensor, creates a substring starting at index pos with a total length of len.

If len defines a substring that would extend beyond the length of the input string, then as many characters as possible are used.

If pos is negative or specifies a character index larger than any of the input strings, then an InvalidArgumentError is thrown.

pos and len must have the same shape, otherwise a ValueError is thrown on Op creation.

NOTE: Substr supports broadcasting up to two dimensions. More about broadcasting here

Examples

Using scalar pos and len:

```python input = [b’Hello’, b’World’] position = 1 length = 3

output = [b’ell’, b’orl’] ```

Using pos and len with same shape as input:

```python input = [[b’ten’, b’eleven’, b’twelve’], [b’thirteen’, b’fourteen’, b’fifteen’], [b’sixteen’, b’seventeen’, b’eighteen’]] position = [[1, 2, 3], [1, 2, 3], [1, 2, 3]] length = [[2, 3, 4], [4, 3, 2], [5, 5, 5]]

output = [[b’en’, b’eve’, b’lve’], [b’hirt’, b’urt’, b’te’], [b’ixtee’, b’vente’, b’hteen’]] ```

Broadcasting pos and len onto input:

``` input = [[b’ten’, b’eleven’, b’twelve’], [b’thirteen’, b’fourteen’, b’fifteen’], [b’sixteen’, b’seventeen’, b’eighteen’], [b’nineteen’, b’twenty’, b’twentyone’]] position = [1, 2, 3] length = [1, 2, 3]

output = [[b’e’, b’ev’, b’lve’], [b’h’, b’ur’, b’tee’], [b’i’, b’ve’, b’hte’], [b’i’, b’en’, b’nty’]] ```

Broadcasting input onto pos and len:

``` input = b’thirteen’ position = [1, 5, 7] length = [3, 2, 1]

output = [b’hir’, b’ee’, b’n”] ```

Arguments:

  • scope: A Scope object
  • input: Tensor of strings
  • pos: Scalar defining the position of first character in each substring
  • len: Scalar defining the number of characters to include in each substring

Returns:

Substr block

Source link : https://github.com/EXPNUNI/enuSpaceTensorflow/blob/master/enuSpaceTensorflow/tf_string.cpp

Argument:

  • Scope scope : A Scope object (A scope is generated automatically each page. A scope is not connected.)
  • Input input: connect Input node.
  • Input pos: connect Input node.
  • Input len: connect Input node.

Return:

  • Output output : Output object of Substr class object.

Result:

  • std::vector(Tensor) product_result : Returned object of executed result by calling session.

Using Method