code: def cummin(
      s: "Stream[float]", skipna: bool = True
  ) -> "Stream[float]":
      """Computes the cumulative minimum of a stream.
  
      Parameters
      ----------
      s : `Stream[float]`
          A float stream.
      skipna : bool, default True
          Exclude NA/null values. If a value is NA, the result will be NA.
  
      Returns
      -------
      `Stream[float]`
          The cumulative minimum stream of `s`.
      """
      return CumMin(skip_na=skipna)(s).astype("float")
  
imports: import numpy
  from tensortrade.feed.core.base import Stream
  from tensortrade.feed.api.float import Float
label_desc: Use image node_id 3 for calling a global function with example usage: cummin(s, skipna) and returns: CumMin