roll¶

dragon.vm.tensorflow.roll(
  input,
  shift,
  axis,
  name=None
)[source]¶

Roll elements along the given axis.

axis could be negative or None:

x = tf.constant([[1, 2, 3], [4, 5, 6]])

# A negative axis is the last-k axis
print(tf.roll(x, shift=1, axis=1))  # [[3, 1, 2], [6, 4, 5]]
print(tf.roll(x, shift=1, axis=-1))  # Equivalent

# If axis is None, roll input as a vector
print(tf.roll(x, shift=1))  # [[6, 1, 2], [3, 4, 5]]

# Also, axis could be a sequence of integers
print(tf.roll(x, shift=(1, 1), axis=(0, 1)))  # [[6, 4, 5], [3, 1, 2]]
print(tf.roll(x, shift=(1, -1), axis=(0, 1)))  # [[5, 6, 4], [2, 3, 1]]

Parameters:

• input (dragon.Tensor) – The input tensor.
• shift (Union[int, Sequence[int], dragon.Tensor]) – The rolling offset of each axis.
• axis (Union[int, Sequence[int]], optional) – The axis to roll.
• name (str, optional) – The operation name.

Returns:

dragon.Tensor – The output tensor.