TypeError: 'NoneType' object is not subscriptable

[morrowyn]

Hi,

I have tried running the attendance example. However I run into the following error:
TypeError: 'NoneType' object is not subscriptable

Image faces_detected.jpg written to filesystem:  True
Client created (student_test.py file)
127.0.0.1 - - [28/May/2022 20:04:11] "POST / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 2091, in __call__
    return self.wsgi_app(environ, start_response)
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 2076, in wsgi_app
    response = self.handle_exception(e)
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "E:\weaviate-examples\attendance-system-example\venv\Lib\site-packages\flask\app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "E:\weaviate-examples\attendance-system-example\upload_student.py", line 44, in upload_image
    attendance = markAttendance(faces,own=True) #.drop_duplicates()
  File "E:\weaviate-examples\attendance-system-example\mark.py", line 18, in markAttendance
    name = testit(img)
  File "E:\weaviate-examples\attendance-system-example\student_test.py", line 87, in testit
    ans = res['data']['Get']['Students'][0]['labelName']
TypeError: 'NoneType' object is not subscriptable
127.0.0.1 - - [28/May/2022 20:04:11] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [28/May/2022 20:04:11] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [28/May/2022 20:04:11] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
 * Detected change in 'E:\\weaviate-examples\\attendance-system-example\\upload_student.py', reloading
libpng warning: iCCP: known incorrect sRGB profile
 * Restarting with stat
C:\Program Files\JetBrains\PyCharm Community Edition 2020.2.2\plugins\python-ce\helpers\pydev\pydevd.py:1844: DeprecationWarning: currentThread() is deprecated, use current_thread() instead
  dummy_thread = threading.currentThread()
 * Debugger is active!
 * Debugger PIN: 521-878-846
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [28/May/2022 20:04:59] "GET / HTTP/1.1" 200 -

I used the images from the following directories to test it out:
attendance-system-example\students and attendance-system-example\test

Regards,

[morrowyn]

And this is the result from student_add.py:

Client created (student_add.py file)
Schema class created
6 Student images from Mbappe added.
7 Student images from Messi added.
7 Student images from Ronaldo added.
Images added

This is the response from res = client.query.get("Students", ["labelName", "_additional {certainty}"]).with_near_vector(nearVector).do()

{'data': {'Get': {'Students': None}}, 'errors': [{'locations': [{'column': 6, 'line': 1}], 'message': "explorer: get class: vector search: object vector search at index students: shard students_YaDbfHtOdSyd: vector search: knn search: distance between entrypint and query node: vector lengths don't match: 2048 vs 128", 'path': ['Get', 'Students']}]}

[bobvanluijt]

CC: @sky-2002 – can you maybe help out? Thanks :)

[sky-2002]

Sure @bobvanluijt , I will look into this and get back ! Thanks @morrowyn for bringing up the issue.

[sky-2002]

Hello @morrowyn , as you mentioned, you have used the directories "attendance-system-example\students" and "attendance-system-example\test" to test out the example, I believe that you have used the "/students" directory to add the individual images and you tried to test on test images.

After looking at the response that you have provided,
"{'data': {'Get': {'Students': None}}, 'errors': [{'locations': [{'column': 6, 'line': 1}], 'message': "explorer: get class: vector search: object vector search at index students: shard students_YaDbfHtOdSyd: vector search: knn search: distance between entrypint and query node: vector lengths don't match: 2048 vs 128", 'path': ['Get', 'Students']}]}"

It says that the vector lengths do not match.

Probable reason:
What I believe to be a probable reason for this might be that you are using your own vectors while adding data i.e. you are using the "student_own_add.py" file, which uses OpenCV functions to generate a face vector/embedding of length 128. But while querying, maybe you are using the "testImage" function which uses weaviate module to vectorize the image. And as the weaviate's module generates a vector of length 2048, there is no possibility of finding a dot product between these vectors. And hence the issue. I suggest to use the "testit" function to test images when you are using your own vectors. And the "testImage" function when using modules.

Something else 🤔 ?
If the above is not the case, please do let me know here or reach out via slack.
Though I feel that the above mentioned reason is the cause of this, I am still looking for more places in the code where this can go wrong. I will let you know if I find something else that causes this same issue.

Things learnt from this:
I think I should name the functions so that they are more intuitive, I will definitely fix that, also I am adding some checks to the code which will prevent these kind of issues and raise informative errors so as to make it easy to fix.

Thanks ! 😇