title: Error on running exe build using Pyinstaller
body: <p>Following is the list of modules I am using:</p>
  
  <pre><code>import sys
  import cv2
  import numpy as np
  import pytesseract
  from PIL import Image
  from sklearn.cluster import MeanShift, estimate_bandwidth
  from sklearn.datasets.samples_generator import make_blobs
  import re
  import jellyfish
  </code></pre>
  
  <p>Exception </p>
  
  <pre><code>Traceback (most recent call last):
    File "c:\python\lib\site-packages\matplotlib\backends\backend_webagg.py", line 29, in &lt;module&gt;
      import tornado
  ModuleNotFoundError: No module named 'tornado'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "&lt;string&gt;", line 12, in &lt;module&gt;
    File "c:\python\lib\site-packages\matplotlib\backends\backend_webagg.py", line 31, in &lt;module&gt;
      raise RuntimeError("The WebAgg backend requires Tornado.")
  </code></pre>
  
  <p>Error on running the generated exe:</p>
  
  <pre><code>File "c:\python\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 631, in exec_module
      exec(bytecode, module.__dict__)
    File "site-packages\scipy\sparse\linalg\isolve\iterative.py", line 7, in &lt;module&gt;
    File "c:\python\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 714, in load_module
      module = loader.load_module(fullname)
  ImportError: DLL load failed: The specified module could not be found.
  [22724] Failed to execute script main
  </code></pre>
  
  <p>I have tried the suggested solutions on git links but nothing seems to work. The script itself runs fine. Iam on Windows 10, Python 3.6</p>