class_docstr: Column centering of vectors and matrices.
  
  Attributes
  -----------
  col_means : numpy.ndarray [n_columns]
      NumPy array storing the mean values for centering after fitting
      the MeanCenterer object.
  
  Examples
  -----------
  For usage examples, please see
  https://rasbt.github.io/mlxtend/user_guide/preprocessing/MeanCenterer/
code: def _get_array(self, X):
      if isinstance(X, list):
          X_fl = np.asarray(X, dtype="float")[:, None]
      else:
          X_fl = X.astype("float")
      return X_fl
  
file_path: mlxtend/mlxtend/preprocessing/mean_centering.py
imports: import numpy
label_desc: Use image node_id 5 for calling the MeanCenterer obj's underlying member method code with example usage: obj._get_array(X) and returns: X_fl