count_finite

count_finite(a, axis=None, *, validate=True)

Return the number of finite values.

Parameters

a : array_like: Input data. Supported numeric inputs are normalized to a contiguous kernel array when validate=True. Computed reducers promote integer and bool inputs to float64; exact selection reducers keep integer and bool dtypes where the selected value can be returned exactly. Complex and object arrays are not supported.
axis : None, 0, -1, or int = None: Axis to reduce. None reduces the whole array. 0 reduces strided reducing-axis slices into the remaining shape. -1 and ndim - 1 reduce contiguous slices. Other axes raise NotImplementedError.
validate : bool = True: If True, check dtype, dimensionality, contiguity, and axis validity before entering the Rust kernel. If False, the caller must provide a contiguous supported kernel dtype (float32, float64, bool, or a NumPy integer dtype). validate=False skips dtype promotion: integer and bool arrays are reduced directly, while complex and object arrays remain unsupported.

out : int or ndarray of int: Number of finite values. axis=None returns a Python int. Axis reductions return an integer array with the reduced axis removed.

Counts are always finite-only: this reducer counts values for which isfinite is true, regardless of the policy used by other reducers.