code: def constant(rate: float) -> Iterable[float]:
      """Yield a constant rate."""
      while True:
          yield rate
  
file_path: thinc/thinc/schedules.py
imports: from typing import Iterable
  import numpy
  from .config import registry
label_desc: Use image node_id 2 for calling a global function with example usage: constant(rate) without return types