code: def fetch_raw_metadata_frame(self, api_key, page_number):
      if page_number > 1:
          return pd.DataFrame([])
  
      raw = pd.read_json(
          self._format_metadata_url(
              api_key,
              page_number,
          ),
          orient="index",
      )
  
      raw = raw.sort_index().reset_index()
      raw.rename(
          columns={"index": "symbol"},
          inplace=True,
      )
  
      raw = raw[raw["isFrozen"] == 0]
      return raw
  
file_path: catalyst/catalyst/data/bundles/poloniex.py
imports: import sys
  from six.moves.urllib.parse import urlencode
  import pandas
  from catalyst.data.bundles.core import register_bundle
  from catalyst.data.bundles.base_pricing import BaseCryptoPricingBundle
  from catalyst.utils.memoize import lazyval
  from catalyst.curate.poloniex import PoloniexCurator
label_desc: Use image node_id 6 for calling the PoloniexBundle obj's underlying member method code with example usage: obj.fetch_raw_metadata_frame(api_key, page_number) and returns: raw, pd