code: def _build_code(self, group_filter=None):
      group = self.cfg.get("group")
      group_filter_str = ""
      if group_filter:
          group_filter_str = "\ndf = df.query({filter})".format(
              filter=triple_quote(group_filter_str)
          )
      return (
          "df = pd.concat(g for _, g in df.groupby(['{group}']) if len(g) > 1)"
          "{filter}"
      ).format(group="','".join(group), filter=group_filter_str)
  
imports: import pandas
  import dtale.global_state
  from dtale.query import run_query
  from dtale.utils import dict_merge, grid_columns, grid_formatter, triple_quote
  from dtale.charts.utils import build_group_inputs_filter
label_desc: Use image node_id 4 for calling the ShowDuplicates obj's underlying member method code with example usage: obj._build_code(group_filter) and returns: str