code: def __call__(self, s: SeriesT) -> SeriesT:
      return s.dt.is_year_start
  
imports: from typing import Any, TYPE_CHECKING, Optional
  import pandas
  from .ASTPredicate import ASTPredicate
label_desc: Use image node_id 1 for calling the IsYearStart obj's underlying member method code with example usage: obj.__call__(s) and returns: s