code: def abs_target_mean(target) -> float:
      r"""
      .. math::
  
          abs\_target\_mean = mean(|Y|)
      """
      return np.mean(np.abs(target))
  
file_path: gluonts/src/gluonts/evaluation/metrics.py
imports: from typing import Optional
  import numpy
  from gluonts.time_feature import get_seasonality
label_desc: Use image node_id 11 for calling a global function with example usage: abs_target_mean(target) and returns: np