COO.maybe_densify
- COO.maybe_densify(max_size=1000, min_density=0.25)[source]
Converts this
COO
array to anumpy.ndarray
if not too costly.- Parameters:
- Returns:
The dense array.
- Return type:
- Raises:
ValueError – If the returned array would be too large.
Examples
Convert a small sparse array to a dense array.
>>> s = COO.from_numpy(np.random.rand(2, 3, 4)) >>> x = s.maybe_densify() >>> np.allclose(x, s.todense()) True
You can also specify the minimum allowed density or the maximum number of output elements. If both conditions are unmet, this method will throw an error.
>>> x = np.zeros((5, 5), dtype=np.uint8) >>> x[2, 2] = 1 >>> s = COO.from_numpy(x) >>> s.maybe_densify(max_size=5, min_density=0.25) Traceback (most recent call last): ... ValueError: Operation would require converting large sparse array to dense