title: Unable to figure out "No module named 'paddle.fluid'" , this is with regards to the paddleOCR installation on ubuntu 16.04. Details have been provided
body: <p><strong>File &quot;/robust/envs/robust/lib/python3.9/site-packages/paddleocr/tools/infer/utility.py&quot;, line 20, in 
  from paddle.fluid.core import PaddleTensor
  ModuleNotFoundError: No module named 'paddle.fluid'</strong></p>
  <p>I am trying to use paddleocr on linux 16.04.</p>
  <p>unfortunately while running this :
  <strong>ocr = PaddleOCR(use_angle_cls=True, lang='en')</strong> got this error.</p>
  <p><strong>Versions :</strong></p>
  <p>Python - 3.9</p>
  <p>paddlepaddle - 2.0.0rc0</p>
  <p>pip - 20.3.3</p>
  <p>Here Robust is my virtual env created using conda .</p>
  <p>Unable to solve to issue.</p>
  <p>I found this thread
  <a href="https://github.com/PaddlePaddle/paddle2onnx/issues/36" rel="nofollow noreferrer">https://github.com/PaddlePaddle/paddle2onnx/issues/36</a>
  But this doesn't solve the issue.</p>
  <p>While this works fine on win</p>