class_docstr: Custom time series parameter fitter. todo: write docstring.
  
  todo: describe your custom time series parameter fitter here
  
  Hyper-parameters
  ----------------
  parama : int
      descriptive explanation of parama
  paramb : string, optional (default='default')
      descriptive explanation of paramb
  paramc : boolean, optional (default= whether paramb is not the default)
      descriptive explanation of paramc
  and so on
  
  Components
  ----------
  est : sktime.estimator, BaseEstimator descendant
      descriptive explanation of est
  est2: another estimator
      descriptive explanation of est2
  and so on
docstr: Update fitted parameters on more data.
  
  private _update containing the core logic, called from update
  
  State required:
      Requires state to be "fitted".
  
  Accesses in self:
      Fitted model attributes ending in "_"
  
  Writes to self:
      Sets fitted model attributes ending in "_"
  
  Parameters
  ----------
  X : guaranteed to be of a type in self.get_tag("X_inner_mtype")
      Time series with which to update the estimator.
  
  Returns
  -------
  self : reference to self
docstr_tok: ["Update","fitted","parameters","on","more","data",".","private","_update","containing","the","core","logic",",","called","from","update","State","required",":","Requires","state","to","be","``","fitted","''",".","Accesses","in","self",":","Fitted","model","attributes","ending","in","``","_","''","Writes","to","self",":","Sets","fitted","model","attributes","ending","in","``","_","''","Parameters","--","--","--","--","--","X",":","guaranteed","to","be","of","a","type","in","self.get_tag","(","``","X_inner_mtype","''",")","Time","series","with","which","to","update","the","estimator",".","Returns","--","--","--","-","self",":","reference","to","self"]
code: def _update(self, X):
      """Update fitted parameters on more data.
  
      private _update containing the core logic, called from update
  
      State required:
          Requires state to be "fitted".
  
      Accesses in self:
          Fitted model attributes ending in "_"
  
      Writes to self:
          Sets fitted model attributes ending in "_"
  
      Parameters
      ----------
      X : guaranteed to be of a type in self.get_tag("X_inner_mtype")
          Time series with which to update the estimator.
  
      Returns
      -------
      self : reference to self
      """
  
file_path: sktime/extension_templates/param_est.py
imports: from sktime.param_est.base import BaseParamFitter
label_desc: Use image node_id 3 for calling the MyTimeSeriesParamFitter obj's underlying member method code with example usage: obj._update(X) without return types