code: def _nested_cell_timepoints(cell):
      if _cell_is_series_or_array(cell):
          n_timepoints = cell.shape[0]
      else:
          n_timepoints = 0
      return n_timepoints
  
imports: import numpy
  import pandas
  from sktime.datatypes._convert_utils._coerce import _coerce_df_dtypes
  from sktime.datatypes._convert_utils._convert import _extend_conversions
  from sktime.datatypes._panel._registry import MTYPE_LIST_PANEL
  from sktime.utils.pandas import df_map
  from sktime.utils.validation._dependencies import _check_soft_dependencies
label_desc: Use image node_id 6 for calling a global function with example usage: _nested_cell_timepoints(cell) and returns: n_timepoints