Thanks for your reply John DeRosa but the question is about what is causing
the exception because I'm not using threads at all and the error says
"*'Thread'
object has no attribute '_children'"*. I'm catching the error and printing
it out before the return as you can see in the log.
El miércoles, 22 de abril de 2015, 19:13:55 (UTC-3), John DeRosa escribió:
>
> If you get an exception, the “except” clause will drop down into the
> “return” statement, and classification_serializer will be referenced before
> it’s assigned to. (Because it never was assigned to.)
>
> John
>
> On Apr 22, 2015, at 2:36 PM, Cristian Javier Martinez <
> martinezcri...@gmail.com <javascript:>> wrote:
>
> Hi! I'm using the django rest framework and successfully deployed an
> application in a production environment but I'm having an strange error
> related to threads when I call a method that performs a simple
> classification task (using a scikit learn classifier) and I have no idea
> what is causing the error. This is the method in views.py
>
> @api_view(['GET', 'POST'])
> def classify_item(request):
> """
> Classify item, or list classifications.
> """
> if request.method == 'GET':
> items = Item.objects.all()
> serializer = ItemSerializer(items, many=True)
> return Response(serializer.data)
>
> elif request.method == 'POST':
> serializer = ItemSerializer(data=request.data['item'])
> if serializer.is_valid():
> try:
> item = serializer.data
> filter_name = request.data['filter']
>
>
> # fix encoding
> item_dict = {}
> for key in item:
> value = item[key]
> if isinstance(value, unicode):
> value =
> value.encode('utf-8')
> item_dict[key] = value
>
> classifier_name =
> CLASSIFIER_NAME_BY_FILTER[filter_name]
>
> logger.debug("retrieving the persisted
> classifier and classifing the item")
> clf =
> joblib.load(os.path.join(CLASSIFIERS_PATH, filter_name, classifier_name))
>
> logger.debug("predicting probabilities")
> data = pd.DataFrame([item_dict])
>
> logger.debug("scoring item")
> score = clf.predict(data)[0][1]
>
> logger.debug("score: {}".format(score))
>
>
> # create and save classification
> classification =
> Classification(classifier_name=classifier_name,score=score,item_id=item['_id'])
> classification_serializer =
> ClassificationSerializer(classification)
> #classification_serializer.save()
> except Exception as e:
> logger.error("Ocurrio un error al intentar
> parsear el item: {}".format(e))
> return Response(classification_serializer.data,
> status=status.HTTP_201_CREATED)
>
> return Response(serializer.errors,
> status=status.HTTP_400_BAD_REQUEST)
>
> And the output is:
>
> [22/Apr/2015 21:14:56] DEBUG [classifiers.views:63] retrieve the
> classifier for the given sited_id and classify item
> [22/Apr/2015 21:15:14] DEBUG [classifiers.views:66] predicting
> probabilities
> [22/Apr/2015 21:15:14] DEBUG [classifiers.views:69] scoring item
> [22/Apr/2015 21:15:14] ERROR [classifiers.views:80] Ocurrio un error al
> intentar parsear el item: *'Thread' object has no attribute '_children'*
> [22/Apr/2015 21:15:14] ERROR [django.request:256] Internal Server Error:
> /items/
> Traceback (most recent call last):
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/django/core/handlers/base.py",
>
> line 132, in get_response
> response = wrapped_callback(request, *callback_args, **callback_kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/newrelic-2.50.0.39/newrelic/hooks/framework_django.py",
>
> line 499, in wrapper
> return wrapped(*args, **kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/django/views/decorators/csrf.py",
>
> line 58, in wrapped_view
> return view_func(*args, **kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/django/views/generic/base.py",
>
> line 71, in view
> return self.dispatch(request, *args, **kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/newrelic-2.50.0.39/newrelic/hooks/component_djangorestframework.py",
>
> line 27, in _nr_wrapper_APIView_dispatch_
> return wrapped(*args, **kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/rest_framework/views.py",
>
> line 452, in dispatch
> response = self.handle_exception(exc)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/rest_framework/views.py",
>
> line 449, in dispatch
> response = handler(request, *args, **kwargs)
> File
> "/home/keepcon/meli_filters_env/local/lib/python2.7/site-packages/rest_framework/decorators.py",
>
> line 50, in handler
> return func(*args, **kwargs)
> File "/home/keepcon/meli_filters/classifiers/views.py", line 81, in
> classify_item
> return Response(classification_serializer.data,
> status=status.HTTP_201_CREATED)
> UnboundLocalError: local variable 'classification_serializer' referenced
> before assignment
>
> I was having an UnicodeEncodeError but I fixed it by adding "the fix
> encoding" step. I'll appreciate any cue about what could be causing this
> error, I don't understand why the error says something about threads since
> I'm not using threads.
>
> Thanks in advance!
>
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users...@googlegroups.com <javascript:>.
> To post to this group, send email to django...@googlegroups.com
> <javascript:>.
> Visit this group at http://groups.google.com/group/django-users.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/da84ec7a-24a2-46b5-8d72-2d46c2d5a304%40googlegroups.com
>
> <https://groups.google.com/d/msgid/django-users/da84ec7a-24a2-46b5-8d72-2d46c2d5a304%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
> For more options, visit https://groups.google.com/d/optout.
>
>
>
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-users+unsubscr...@googlegroups.com.
To post to this group, send email to django-users@googlegroups.com.
Visit this group at http://groups.google.com/group/django-users.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/d38108d0-eda7-4e9e-9723-793a3290e030%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
