code: def preprocess_input(x, data_format=None):
      """A placeholder method for backward compatibility.
  
      The preprocessing logic has been included in the mobilenet_v3 model
      implementation. Users are no longer required to call this method to
      normalize the input data. This method does nothing and only kept as a
      placeholder to align the API surface between old and new version of model.
  
      Args:
          x: A floating point `numpy.array` or a tensor.
          data_format: Optional data format of the image tensor/array.
              `None` means the global setting
              `keras.config.image_data_format()` is used
              (unless you changed it, it uses `"channels_last"`).
              Defaults to `None`.
  
      Returns:
          Unchanged `numpy.array` or tensor.
      """
      return x
  
file_path: keras/keras/applications/mobilenet_v3.py
imports: import warnings
  from keras import backend
  from keras import layers
  from keras.api_export import keras_export
  from keras.applications import imagenet_utils
  from keras.models import Functional
  from keras.ops import operation_utils
  from keras.utils import file_utils
label_desc: Use image node_id 10 for calling a global function with example usage: preprocess_input(x, data_format) and returns: x