code: def _extract_channels(filename):
      with tf.io.gfile.GFile(filename, "rb") as f:
          arr = tfds.core.lazy_imports.tifffile.imread(
              io.BytesIO(f.read())
          )
  
      arr = arr.astype("float32")
      return arr
  
file_path: datasets/tensorflow_datasets/image_classification/eurosat.py
imports: import io
  import os
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
label_desc: Use image node_id 1 for calling a global function with example usage: _extract_channels(filename) and returns: arr