torch.isin

torch.isin(elements, test_elements, *, assume_unique=False, invert=False) → Tensor

Tests if each element of elements is in test_elements. Returns a boolean tensor of the same shape as elements that is True for elements in test_elements and False otherwise.

Note

One of elements or test_elements can be a scalar, but not both.

Parameters

• elements (Tensor or Scalar) – Input elements
• test_elements (Tensor or Scalar) – Values against which to test for each input element
• assume_unique (bool, optional) – If True, assumes both elements and test_elements contain unique elements, which can speed up the calculation. Default: False
• invert (bool, optional) – If True, inverts the boolean return tensor, resulting in True values for elements not in test_elements. Default: False

Returns

A boolean tensor of the same shape as elements that is True for elements in test_elements and False otherwise

Example

>>> torch.isin(torch.tensor([[1, 2], [3, 4]]), torch.tensor([2, 3]))
tensor([[False,  True],
        [ True, False]])