code: def set_metadata_index_and_column_names(dim, meta_df):
      
      if dim == "row":
          meta_df.index.name = "rid"
          meta_df.columns.name = "rhd"
      elif dim == "col":
          meta_df.index.name = "cid"
          meta_df.columns.name = "chd"
docs: Sets index and column names to GCTX convention.
      Input:
          - dim (str): Dimension of metadata to read. Must be either "row" or "col"
          - meta_df (pandas.DataFrame): data frame corresponding to metadata fields
              of dimension specified.
      Output:
          None