class_docstr: A transformer that turns time series/panel data into tabular data.
  
  This estimator converts nested pandas dataframe containing time-series/panel data
  with numpy arrays or pandas Series in dataframe cells into a tabular pandas
  dataframe with only primitives in cells. This is useful for transforming time-
  series/panel data into a format that is accepted by standard validation learning
  algorithms (as in sklearn).
class_docstr_tok: ["A","transformer","that","turns","time","series\/panel","data","into","tabular","data",".","This","estimator","converts","nested","pandas","dataframe","containing","time-series\/panel","data","with","numpy","arrays","or","pandas","Series","in","dataframe","cells","into","a","tabular","pandas","dataframe","with","only","primitives","in","cells",".","This","is","useful","for","transforming","time-","series\/panel","data","into","a","format","that","is","accepted","by","standard","validation","learning","algorithms","(","as","in","sklearn",")","."]
docstr: Transform nested pandas dataframe into tabular dataframe.
  
  Parameters
  ----------
  X : pandas DataFrame or 3D np.ndarray
      panel of time series to transform
  y : ignored argument for interface compatibility
  
  Returns
  -------
  Xt : pandas DataFrame
      Transformed dataframe with only primitives in cells.
docstr_tok: ["Transform","nested","pandas","dataframe","into","tabular","dataframe",".","Parameters","--","--","--","--","--","X",":","pandas","DataFrame","or","3D","np.ndarray","panel","of","time","series","to","transform","y",":","ignored","argument","for","interface","compatibility","Returns","--","--","--","-","Xt",":","pandas","DataFrame","Transformed","dataframe","with","only","primitives","in","cells","."]
code: def _transform(self, X, y=None):
      """Transform nested pandas dataframe into tabular dataframe.
  
      Parameters
      ----------
      X : pandas DataFrame or 3D np.ndarray
          panel of time series to transform
      y : ignored argument for interface compatibility
  
      Returns
      -------
      Xt : pandas DataFrame
          Transformed dataframe with only primitives in cells.
      """
      Xt = convert_to(X, to_type="numpyflat", as_scitype="Panel")
      return Xt
  
file_path: sktime/sktime/transformations/panel/reduce.py
imports: import warnings
  import numpy
  import pandas
  from sktime.datatypes import convert, convert_to
  from sktime.transformations.base import BaseTransformer
  from sktime.utils.pandas import df_map
label_desc: Use image node_id 1 for calling the Tabularizer obj's underlying member method code with example usage: obj._transform(X, y) and returns: Xt