code: def load_sample(self, sample: Dict[str, Any]) -> Dict[str, Any]:
      h, w = sample[DataKeys.INPUT].shape[-2:]  # H x W
      if DataKeys.METADATA not in sample:
          sample[DataKeys.METADATA] = {}
      sample[DataKeys.METADATA]["size"] = (h, w)
      if DataKeys.TARGET in sample:
          sample[DataKeys.TARGET] = self.format_target(
              sample[DataKeys.TARGET]
          )
      return sample
  
imports: import os
  from typing import Any, Callable, Dict, List, Optional, Union
  import numpy
  import pandas
  from flash.core.data.io.classification_input import ClassificationInputMixin
  from flash.core.data.io.input import DataKeys, Input
  from flash.core.data.utilities.classification import MultiBinaryTargetFormatter, TargetFormatter
  from flash.core.data.utilities.data_frame import resolve_files, resolve_targets
  from flash.core.data.utilities.loading import AUDIO_EXTENSIONS, IMG_EXTENSIONS, NP_EXTENSIONS, load_data_frame, load_spectrogram
  from flash.core.data.utilities.paths import PATH_TYPE, filter_valid_files, make_dataset
  from flash.core.data.utilities.samples import to_samples
  from flash.core.utilities.imports import requires
label_desc: Use image node_id 1 for calling the AudioClassificationInput obj's underlying member method code with example usage: obj.load_sample(sample) and returns: sample