class_docstr: Secure multi-party linear regression at plaintext speed.
  
  Computes the necessary components of the normal equations solution to a
  linear regression.
code: def summarize(self, summary_level):
      # TODO: coefficient variance
      # TODO: stderror
      # TODO: p-vals
      raise NotImplementedError()
  
file_path: tf-encrypted/examples/bloom/regressor.py
imports: import numpy
  import tensorflow
  import tf_encrypted
label_desc: Use image node_id 7 for calling the BloomRegressor obj's underlying member method code with example usage: obj.summarize(summary_level) without return types