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!
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