code: def forecast_start(entry, time_axis: int = -1):
      return (
          entry[FieldName.START]
          + entry[FieldName.TARGET].shape[time_axis]
      )
  
imports: from typing import Optional
  import pandas
  from .common import DataEntry
  from .field_names import FieldName
label_desc: Use image node_id 1 for calling a global function with example usage: forecast_start(entry, time_axis) and returns: unknown