code: def target_transformation_length(
      target: np.ndarray, pred_length: int, is_train: bool
  ) -> int:
      return target.shape[-1] + (0 if is_train else pred_length)
  
imports: from typing import List, Optional, Union, Type
  import numpy
  import pandas
  from gluonts.core.component import validated
  from gluonts.dataset.common import DataEntry
  from gluonts.dataset.field_names import FieldName
  from gluonts.time_feature import TimeFeature
  from ._base import MapTransformation, SimpleTransformation
label_desc: Use image node_id 1 for calling a global function with example usage: target_transformation_length(target, pred_length, is_train) and returns: unknown