code: def masked_select(input, mask, out=None):
      return ivy.flatten(input[mask], out=out)
  
imports: import ivy
  from ivy.func_wrapper import with_unsupported_dtypes
  from ivy.functional.frontends.torch.func_wrapper import to_ivy_arrays_and_back, numpy_to_torch_style_args, to_ivy_shape
  import ivy.functional.frontends.torch
label_desc: Use image node_id 18 for calling a global function with example usage: masked_select(input, mask, out) and returns: ivy