def get(request, id):
user_id = auth.get_user(request).id
time.sleep(1)
try:
rating = Rating.objects.get(user_id=user_id, book_id=id)
return RestJsonResponse(rating.to_dict_without_user_and_book())
except Rating.DoesNotExist:
return RestJsonResponse(code='404', msg='no such rating')
def process_exception(request, exception):
return
if isinstance(exception, ObjectDoesNotExist):
pass
# return RestJsonResponse(msg='not found', code='404')
elif isinstance(exception, KeyError):
return RestJsonResponse(msg='property not found: ' + str(exception), code='404')
elif isinstance(exception, AttributeError) and 'Request\' object has no attribute \'info\'' in str(exception):
return RestJsonResponse(msg='request content type must be application/json', code='400', status=400)
def login(request):
username = request.info['username']
password = request.info['password']
user = auth.authenticate(username=username, password=password)
if user is None:
return RestJsonResponse(msg='wrong username or password',
code="403",
status=200)
auth.login(request, user)
return RestJsonResponse()
def books_detail_ratings(request, id):
page_number = int(request.GET.get('page_number', '1'))
order_by = request.GET.get('order_by', 'id')
if 'user' not in order_by and 'rating' not in order_by:
desc = False
if order_by[0] == '-':
desc = True
order_by = order_by[1:]
order_by = 'user__' + order_by
if desc:
order_by = '-' + order_by
ratings = Rating.objects.filter(book__id=id,
deleted=False).order_by(order_by)
if 'user_name' in request.GET:
ratings = ratings.filter(user__name__contains=request.GET['user_name'])
page_size = int(request.GET.get('page_size', str(ratings.count())))
page = Paginator(ratings,
page_size if page_size > 0 else 1).page(page_number)
return RestJsonResponse({
'count':
page.paginator.count,
'content':
list(map(lambda e: e.to_dict(), list(page))),
})
def delete(request, id):
book = Book.objects.get(id=id)
book.deleted = True
book.save()
Rating.objects.filter(book_id=book.id).update(deleted=True)
time.sleep(1)
return RestJsonResponse()
def recommendations_regenerate_similarity(request):
recommendation.regenerate_similarity()
return RestJsonResponse({
'cost_seconds':
str(recommendation.get_cost_seconds()),
'size':
sys.getsizeof(recommendation.get_similarity()),
})
def get(request):
recalls = Metrics.objects.filter(algorithm_name='item_cf',
type='recall').order_by('k')
ans = []
for recall in recalls:
ans.append({
'k': recall.k,
'value': recall.value,
})
return RestJsonResponse(ans)
def get(request):
precisions = Metrics.objects.filter(algorithm_name='item_cf',
type='precision').order_by('k')
ans = []
for precision in precisions:
ans.append({
'k': precision.k,
'value': precision.value,
})
return RestJsonResponse(ans)
def get(request):
coverages = Metrics.objects.filter(algorithm_name='item_cf',
type='coverage').order_by('k')
ans = []
for coverage in coverages:
ans.append({
'k': coverage.k,
'value': coverage.value,
})
return RestJsonResponse(ans)
pass
def get(request):
page_number = int(request.GET.get('page_number', '1'))
order_by = request.GET.get('order_by', 'id')
users = User.objects.order_by(order_by)
if 'name' in request.GET:
users = users.filter(name__contains=request.GET['name'])
if 'location' in request.GET:
users = users.filter(location__contains=request.GET['location'])
page_size = int(request.GET.get('page_size', str(users.count())))
page = Paginator(users,
page_size if page_size > 0 else 1).page(page_number)
return RestJsonResponse(page)
def put(request, id):
user = User.objects.filter(id=id)
request.info.pop('id')
request.info.pop('password')
info = dict()
info['username'] = request.info['username']
info['email'] = request.info['email']
info['location'] = request.info['location']
info['age'] = request.info['age']
info['avatar_url'] = request.info['avatar_url']
user.update(**info)
return RestJsonResponse(User.objects.get(id=id))
def get(request):
page_number = int(request.GET.get('page_number', '1'))
order_by = request.GET.get('order_by', 'id')
books = Book.objects.filter(deleted=False).order_by(order_by)
if 'title' in request.GET:
books = books.filter(title__contains=request.GET['title'])
if 'isbn' in request.GET:
books = books.filter(isbn__contains=request.GET['isbn'])
page_size = int(request.GET.get('page_size', str(books.count())))
page = Paginator(books,
page_size if page_size > 0 else 1).page(page_number)
return RestJsonResponse(page)
def recommendations_status(request):
recommendation.update_similarity()
return RestJsonResponse({
'precision_generating':
recommendation.get_redis_server().get('books_recommend:precision_mark')
is not None,
'recall_generating':
recommendation.get_redis_server().get('books_recommend:recall_mark')
is not None,
'coverage_generating':
recommendation.get_redis_server().get('books_recommend:coverage_mark')
is not None,
'cost_seconds':
recommendation.get_cost_seconds()
})
def put(request, id):
user_id = auth.get_user(request).id
rating_id = None
try:
rating_id = Rating.objects.get(user_id=user_id, book_id=id).id
except Rating.DoesNotExist:
pass
print(request.info)
rating = Rating(book_id=id,
user_id=user_id,
rating=request.info['rating'])
rating.id = rating_id
rating.save()
time.sleep(1)
return RestJsonResponse()
def put(request):
ks = request.info['ks']
recommendation.get_redis_server().set('books_recommend:recall_mark',
'')
precisions = dict()
for k in ks:
precisions[k] = _recommendations_update_recall(k)
Metrics.objects.filter(algorithm_name='item_cf',
type='recall').delete()
for k, value in precisions.items():
precision = Metrics(algorithm_name='item_cf',
type='recall',
k=k,
value=value,
description='none')
precision.save()
recommendation.get_redis_server().delete('books_recommend:recall_mark')
return RestJsonResponse(None)
def users_detail_recommendations(request, id):
page_number = int(request.GET.get('page_number', '1'))
page_size = int(request.GET.get('page_size', 100))
k = int(request.GET.get('k', 5))
ignore_rated = request.GET.get('ignore_rated', 'False').lower() == 'true'
print(ignore_rated)
book_ids_rated = set()
if ignore_rated:
books = Rating.objects.filter(user_id=id,
deleted=False).values_list('book_id')
for book in books:
book_ids_rated.add(book[0])
ratings = Rating.objects.filter(user_id=id, rating__gt=3)
ranks = {}
for item in ratings:
if item.book_id not in recommendation.get_similarity_sorted():
continue
for book_id, p in recommendation.get_similarity_sorted()[
item.book_id][0:k]:
if book_id in book_ids_rated:
continue
ranks.setdefault(book_id, 0.0)
ranks[book_id] += p * 1
ranks = sorted(ranks.items(), key=operator.itemgetter(1), reverse=True)
books = []
for rank in ranks[page_size * (page_number -
1):min(page_size *
page_number, Book.objects.count())]:
book = Book.objects.get(id=rank[0]).to_dict()
book['rank'] = rank[1]
books.append(book)
return RestJsonResponse({'count': len(ranks), 'content': books})
def recommendations_f_measure(request):
recalls = Metrics.objects.filter(algorithm_name='item_cf',
type='recall').order_by('k')
precisions = Metrics.objects.filter(algorithm_name='item_cf',
type='precision').order_by('k')
recall_dict = {}
for recall in recalls:
recall_dict[recall.k] = recall.value
precision_dict = {}
for precision in precisions:
precision_dict[precision.k] = precision.value
ans = []
for k, recall in recall_dict.items():
if k not in precision_dict:
continue
precision = precision_dict[k]
ans.append({
'k':
k,
'value':
round(2 * precision * recall / (precision + recall), 6)
})
return RestJsonResponse(ans)
def get(request):
user = auth.get_user(request)
# time.sleep(2)
return RestJsonResponse(user)
def logout(request):
auth.logout(request)
return RestJsonResponse()
def get(request, id):
book = Book.objects.get(id=id)
return RestJsonResponse(book)
def users_list(request):
users = auth.models.User.objects.all()
return RestJsonResponse(users)
def post(request):
user = User(**request.info)
user.id = None
user.save()
return RestJsonResponse(user)
def get(request, id):
user = User.objects.get(id=id)
return RestJsonResponse(user)
def recommendations_update_similarity(request):
recommendation.update_similarity()
return RestJsonResponse(
{'cost_seconds': recommendation.get_cost_seconds()})
def delete(request, id):
user = User.objects.filter(id=id)
user.delete()
return RestJsonResponse()
def post(request):
book = Book(**request.info)
book.id = None
book.save()
return RestJsonResponse(book)
def get(request, id):
rating = Rating.objects.get(id=id)
return RestJsonResponse(rating)
def post(request):
User.objects.create_user(username=request.info['username'],
password=request.info['password'],
email='')
return RestJsonResponse(None)
def put(request, id):
user = User.objects.filter(id=id)
request.info.pop('id')
user.update(**request.info)
return RestJsonResponse(User.objects.get(id=id))
def put(request, id):
book = Book.objects.filter(id=id)
request.info.pop('id')
book.update(**request.info)
time.sleep(1)
return RestJsonResponse(Book.objects.get(id=id))
