code: def warmup(s: "Stream[T]", periods: int) -> "Stream[T]":
      """Creates a warmup stream.
  
      Parameters
      ----------
      s : `Stream[T]`
          A generic stream.
      periods : int
          Number of periods to warm up.
  
      Returns
      -------
      `Stream[T]`
          The warmup stream of `s`.
      """
      return WarmUp(periods=periods)(s)
  
file_path: tensortrade/tensortrade/feed/api/generic/warmup.py
imports: import numpy
  from tensortrade.feed.core.base import Stream, T
label_desc: Use image node_id 1 for calling a global function with example usage: warmup(s, periods) and returns: WarmUp