code: def _find_scalar(key, scalars):
      prefix, tag = _split_scalar_key(key)
      for entry in scalars:
          if (not prefix or prefix == entry["prefix"]) and tag == entry[
              "tag"
          ]:
              return entry
      return None
  
file_path: guildai/guild/filter_util.py
imports: from guild import filter
  from guild import index
  from guild import var
label_desc: Use image node_id 1 for calling a global function with example usage: _find_scalar(key, scalars) and returns: None, entry