code: def nancumsum(a, axis=None, dtype=None, out=None):
      a = ivy.where(ivy.isnan(a), ivy.zeros_like(a), a)
      return ivy.cumsum(a, axis=axis, dtype=dtype, out=out)
  
imports: import ivy
  from ivy.func_wrapper import with_unsupported_dtypes
  from ivy.functional.frontends.jax.func_wrapper import to_ivy_arrays_and_back, handle_jax_dtype
  from ivy.functional.frontends.jax.numpy import promote_types_of_jax_inputs
  from ivy.functional.backends.jax.experimental.elementwise import _normalize_axis_tuple
label_desc: Use image node_id 15 for calling a global function with example usage: nancumsum(a, axis, dtype, out) and returns: ivy