title: Keras_ocr - Failed to recognize_from_boxes
body: <p>I am working with the keras_ocr recognizer and I want it to scan only inside the bounding boxes which I already selected. The API supports this kind of opperation with <code>recognize_from_boxes</code>  Just so you know: <a href="https://keras-ocr.readthedocs.io/en/latest/api.html#keras_ocr.recognition.Recognizer.recognize_from_boxes" rel="nofollow noreferrer">keras_ocr documentation</a>.</p>
  <pre><code>#Parameters
  #images – A list of input images, supplied as numpy arrays with shape (H, W, 3).
  #boxes – A list of groups of boxes, one for each image
  
  #Recognizer_ = Recognizer_.recognize_from_boxes(images = img_list, box_groups= bb_list)
  </code></pre>
  <p>I send to the function two arguments, the first one is the list of images as a numpy array:</p>
  <p><a href="https://i.stack.imgur.com/bgnFW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bgnFW.png" alt="img_list print" /></a></p>
  <p>And secondly, I send the list of bounding boxes:</p>
  <p><a href="https://i.stack.imgur.com/KBxtK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KBxtK.png" alt="bb_list print" /></a></p>
  <p>The problem I get is a type error, <code>TypeError: object of type 'int' has in len()</code>, stating that the type entered is invalid. I would like to understand more about the error and a possible solution. The print related to the error call:</p>
  <p><a href="https://i.stack.imgur.com/T7gX6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/T7gX6.png" alt="bb_list print" /></a></p>