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jax.numpy.nanvar — JAX documentation

jax.numpy.nanvar(a, axis=None, dtype=None, out=None, ddof=0, keepdims=False, where=None)[source]#

Compute the variance of array elements along a given axis, ignoring NaNs.

JAX implementation of numpy.nanvar().

Parameters:

• a (ArrayLike) – input array.

• axis (Axis) – optional, int or sequence of ints, default=None. Axis along which the variance is computed. If None, variance is computed along flattened array.

• dtype (DTypeLike | None) – The type of the output array. Default=None.

• ddof (int) – int, default=0. Degrees of freedom. The divisor in the variance computation is N-ddof, N is number of elements along given axis.

• keepdims (bool) – bool, default=False. If true, reduced axes are left in the result with size 1.

• where (ArrayLike | None) – optional, boolean array, default=None. The elements to be used in the variance. Array should be broadcast compatible to the input.

• out (None) – Unused by JAX.

Returns:

An array containing the variance of array elements along specified axis. If all elements along the given axis are NaNs, returns nan.

Return type:

Array

Examples

By default, jnp.nanvar computes the variance along all axes.

>>> nan = jnp.nan
>>> x = jnp.array([[1, nan, 4, 3],
...                [nan, 2, nan, 9],
...                [4, 8, 6, nan]])
>>> jnp.nanvar(x)
Array(6.984375, dtype=float32)

If axis=1, variance is computed along axis 1.

>>> with jnp.printoptions(precision=2, suppress=True):
...   print(jnp.nanvar(x, axis=1))
[ 1.56 12.25  2.67]

To preserve the dimensions of input, you can set keepdims=True.

>>> with jnp.printoptions(precision=2, suppress=True):
...   print(jnp.nanvar(x, axis=1, keepdims=True))
[[ 1.56]
 [12.25]
 [ 2.67]]

If ddof=1:

>>> with jnp.printoptions(precision=2, suppress=True):
...   print(jnp.nanvar(x, axis=1, keepdims=True, ddof=1))
[[ 2.33]
 [24.5 ]
 [ 4.  ]]

To include specific elements of the array to compute variance, you can use where.

>>> where = jnp.array([[1, 0, 1, 0],
...                    [0, 1, 1, 0],
...                    [1, 1, 0, 1]], dtype=bool)
>>> jnp.nanvar(x, axis=1, keepdims=True, where=where)
Array([[2.25],
       [0.  ],
       [4.  ]], dtype=float32)

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