code: def transform(self, input_array: np.ndarray):
      output = np.log(input_array)
      self.logger.info(f"{self.__class__.__name__} is calculated.")
      return output
  
imports: import logging
  import numpy
  import pytest
  from popmon.base import Module, Pipeline
label_desc: Use image node_id 2 for calling the LogTransformer obj's underlying member method code with example usage: obj.transform(input_array) and returns: output