index_min(x, idx, y, indices_are_sorted=False, unique_indices=False)¶
Pure equivalent of
x[idx] = minimum(x[idx], y).
Returns the value of x that would result from the NumPy-style
x[idx] = minimum(x[idx], y)
Note the index_min operator is pure; x itself is not modified, instead the new value that x would have taken is returned.
Unlike the NumPy code
x[idx] = minimum(x[idx], y), if multiple indices refer to the same location the final value will be the overall min. (NumPy would only look at the last update, rather than all of the updates.)
x – an array with the values to be updated.
idx – a Numpy-style index, consisting of None, integers, slice objects, ellipses, ndarrays with integer dtypes, or a tuple of the above. A convenient syntactic sugar for forming indices is via the
y – the array of updates. y must be broadcastable to the shape of the array that would be returned by x[idx].
indices_are_sorted – whether idx is known to be sorted
unique_indices – whether idx is known to be free of duplicates
>>> x = jax.numpy.ones((5, 6)) >>> jax.ops.index_minimum(x, jax.ops.index[2:4, 3:], 0.) array([[1., 1., 1., 1., 1., 1.], [1., 1., 1., 1., 1., 1.], [1., 1., 1., 0., 0., 0.], [1., 1., 1., 0., 0., 0.], [1., 1., 1., 1., 1., 1.]], dtype=float32)