code: def count_nonzero(input, dim=None):
      return ivy.count_nonzero(input, axis=dim).astype(ivy.int64)
  
imports: import ivy
  from ivy.func_wrapper import with_unsupported_dtypes, with_supported_dtypes
  from ivy.functional.frontends.torch.func_wrapper import to_ivy_arrays_and_back, numpy_to_torch_style_args
  from collections import namedtuple
  import ivy.functional.frontends.torch
label_desc: Use image node_id 8 for calling a global function with example usage: count_nonzero(input, dim) and returns: ivy