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sign

sign ΒΆ

Compute the sign of a tensor.

This method can be used with Numpy data: 

n = np.array([-2, 7, -19])
b = fe.backend.sign(n)  # [-1, 1, -1]

This method can be used with TensorFlow tensors: 

t = tf.constant([-2, 7, -19])
b = fe.backend.sign(t)  # [-1, 1, -1]

This method can be used with PyTorch tensors: 

p = torch.tensor([-2, 7, -19])
b = fe.backend.sign(p)  # [-1, 1, -1]

Parameters:

Name Type Description Default
tensor Tensor

The input value.

 required

Returns:

Type Description
Tensor

The sign of each value of the tensor.

Raises:

Type Description
ValueError

If tensor is an unacceptable data type.
Source code in fastestimator\fastestimator\backend\sign.py 
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def sign(tensor: Tensor) -> Tensor:
    """Compute the sign of a tensor.

    This method can be used with Numpy data:
    ```python
    n = np.array([-2, 7, -19])
    b = fe.backend.sign(n)  # [-1, 1, -1]
    ```

    This method can be used with TensorFlow tensors:
    ```python
    t = tf.constant([-2, 7, -19])
    b = fe.backend.sign(t)  # [-1, 1, -1]
    ```

    This method can be used with PyTorch tensors:
    ```python
    p = torch.tensor([-2, 7, -19])
    b = fe.backend.sign(p)  # [-1, 1, -1]
    ```

    Args:
        tensor: The input value.

    Returns:
        The sign of each value of the `tensor`.

    Raises:
        ValueError: If `tensor` is an unacceptable data type.
    """
    if tf.is_tensor(tensor):
        return tf.sign(tensor)
    elif isinstance(tensor, torch.Tensor):
        return tensor.sign()
    elif isinstance(tensor, np.ndarray):
        return np.sign(tensor)
    else:
        raise ValueError("Unrecognized tensor type {}".format(type(tensor)))