code: def describe_feature(
      feature,
      feature_descriptions=None,
      primitive_templates=None,
      metadata_file=None,
  ):
      """Generates an English language description of a feature.
  
      Args:
          feature (FeatureBase) : Feature to describe
          feature_descriptions (dict, optional) : dictionary mapping features or unique
              feature names to custom descriptions
          primitive_templates (dict, optional) : dictionary mapping primitives or
              primitive names to description templates
          metadata_file (str, optional) : path to json metadata file
  
      Returns:
          str : English description of the feature
      """
      feature_descriptions = feature_descriptions or {}
      primitive_templates = primitive_templates or {}
  
      if metadata_file:
          (
              file_feature_descriptions,
              file_primitive_templates,
          ) = parse_json_metadata(
              metadata_file,
          )
          feature_descriptions = {
              **file_feature_descriptions,
              **feature_descriptions,
          }
          primitive_templates = {
              **file_primitive_templates,
              **primitive_templates,
          }
  
      description = generate_description(
          feature,
          feature_descriptions,
          primitive_templates,
      )
      return description[:1].upper() + description[1:] + "."
  
imports: import json
  import featuretools
label_desc: Use image node_id 1 for calling a global function with example usage: describe_feature(feature, feature_descriptions, primitive_templates, metadata_file) and returns: unknown