title: python pickle UnicodeDecodeError
body: <p>I'm trying to load the mnist character dataset (following the tutorial outlined here: <a href="http://neuralnetworksanddeeplearning.com/chap1.html" rel="noreferrer">http://neuralnetworksanddeeplearning.com/chap1.html</a> )</p>
  
  <p>when I run the load_data_wrapper function I get the error.</p>
  
  <pre><code>UnicodeDecodeError: 'ascii' codec can't decode byte 0x90 in position 614: ordinal not in range(128)
  </code></pre>
  
  <p>The code run is: </p>
  
  <pre><code>import numpy as np
  import gzip
  
  
  def load_data():
      f = gzip.open('../data/mnist.pkl.gz', 'rb')
      training_data, validation_data, test_data = pickle.load(f)
      f.close()
      return (training_data, validation_data, test_data)
  
  def load_data_wrapper():
      tr_d, va_d, te_d = load_data()
      training_inputs = [np.reshape(x, (784,1)) for x in tr_d[0]]
      training_results = [vectorized_result(y) for y in tr_d[1]]
      training_data = zip(training_inputs, training_results)
      validation_inputs = [np.reshape(x,(784, 1))for x in va_d[0]]
      validation_data = zip(validation_inputs, va_d[1])
      test_inputs = [np.reshape(x, (784, 1)) for x in te_d[0]]
      test_data = zip(test_inputs, te_d[1])
      return(training_data, validation_data, test_data)
  
  def vectorized_result(j):
      e = np.zeros((10,1))
      e[j] = 1.0
      return e
  </code></pre>
  
  <p>UPDATE: The problem seems to be that I am trying to unpickle with python 3.6 which was pickled with python 2.x. </p>