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jax.numpy.cumprod — JAX documentation

jax.numpy.cumprod#
jax.numpy.cumprod(a, axis=None, dtype=None, out=None)[source]#

Cumulative product of elements along an axis.

JAX implementation of numpy.cumprod().

Parameters:
  • a (ArrayLike) – N-dimensional array to be accumulated.

  • axis (int | None) – integer axis along which to accumulate. If None (default), then array will be flattened and accumulated along the flattened axis.

  • dtype (DTypeLike | None) – optionally specify the dtype of the output. If not specified, then the output dtype will match the input dtype.

  • out (None) – unused by JAX

Returns:

An array containing the accumulated product along the given axis.

Return type:

Array

Examples

>>> x = jnp.array([[1, 2, 3],
...                [4, 5, 6]])
>>> jnp.cumprod(x)  # flattened cumulative product
Array([  1,   2,   6,  24, 120, 720], dtype=int32)
>>> jnp.cumprod(x, axis=1)  # cumulative product along axis 1
Array([[  1,   2,   6],
       [  4,  20, 120]], dtype=int32)

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