class_docstr: Fits and applies PCA whitening
code: def __init__(self, n_components: int):
      self.n_components = n_components
  
file_path: vissl/vissl/utils/pca.py
imports: import logging
  from typing import Union
  import numpy
  import torch
  from vissl.utils.io import load_file, save_file
label_desc: Use image node_id 1 to create a new PCA object  with example: obj = PCA(n_components)