code: def nancumsum(a, axis=None, dtype=None, out=None):
      """Returns the cumulative sum of an array along a given axis treating Not a
      Numbers (NaNs) as zero.
  
      Args:
          a (cupy.ndarray): Input array.
          axis (int): Axis along which the cumulative sum is taken. If it is not
              specified, the input is flattened.
          dtype: Data type specifier.
          out (cupy.ndarray): Output array.
  
      Returns:
          cupy.ndarray: The result array.
  
      .. seealso:: :func:`numpy.nancumsum`
      """
      a = _replace_nan(a, 0, out=out)
      return cumsum(a, axis=axis, dtype=dtype, out=out)
  
imports: import warnings
  import numpy
  import cupy
  from cupy._core import _routines_math
  from cupy._core import _fusion_thread_local
  from cupy._core import internal
label_desc: Use image node_id 7 for calling a global function with example usage: nancumsum(a, axis, dtype, out) and returns: cumsum