code: def _get_image_c_axis(data_format):
      if data_format.lower() == "chw":
          return -3
      elif data_format.lower() == "hwc":
          return -1
  
file_path: ivy/ivy/functional/frontends/paddle/vision/transforms.py
imports: import ivy
  from ivy.func_wrapper import with_supported_dtypes, with_unsupported_device_and_dtypes
  from ..tensor.tensor import Tensor
  from ivy.functional.frontends.paddle.func_wrapper import to_ivy_arrays_and_back
label_desc: Use image node_id 2 for calling a global function with example usage: _get_image_c_axis(data_format) and returns: unknown, unknown