def _run_evaluation_on_selected_users(self,
recommender_object,
usersToEvaluate,
block_size=1000):
start_time = time.time()
start_time_print = time.time()
results_dict = {}
for cutoff in self.cutoff_list:
results_dict[cutoff] = create_empty_metrics_dict(
self.n_items, self.n_users, recommender_object.get_URM_train(),
self.ignore_items_ID, self.ignore_users_ID, cutoff,
self.diversity_object)
n_users_evaluated = 0
# Start from -block_size to ensure it to be 0 at the first block
user_batch_start = 0
user_batch_end = 0
while user_batch_start < len(self.usersToEvaluate):
user_batch_end = user_batch_start + block_size
user_batch_end = min(user_batch_end, len(usersToEvaluate))
test_user_batch_array = np.array(
usersToEvaluate[user_batch_start:user_batch_end])
user_batch_start = user_batch_end
# Compute predictions for a batch of users using vectorization, much more efficient than computing it one at a time
recommended_items_batch_list = recommender_object.recommend(
test_user_batch_array)
# Compute recommendation quality for each user in batch
for batch_user_index in range(len(recommended_items_batch_list)):
user_id = test_user_batch_array[batch_user_index]
recommended_items = recommended_items_batch_list[
batch_user_index]
# Being the URM CSR, the indices are the non-zero column indexes
relevant_items = self.get_user_relevant_items(user_id)
is_relevant = np.in1d(recommended_items,
relevant_items,
assume_unique=True)
n_users_evaluated += 1
for cutoff in self.cutoff_list:
results_current_cutoff = results_dict[cutoff]
is_relevant_current_cutoff = is_relevant[0:cutoff]
recommended_items_current_cutoff = recommended_items[
0:cutoff]
results_current_cutoff[
EvaluatorMetrics.ROC_AUC.value] += roc_auc(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.PRECISION.value] += precision(
is_relevant_current_cutoff, len(relevant_items))
results_current_cutoff[
EvaluatorMetrics.RECALL.value] += recall(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.RECALL_TEST_LEN.
value] += recall_min_test_len(
is_relevant_current_cutoff,
relevant_items)
results_current_cutoff[EvaluatorMetrics.MAP.value] += map(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.MRR.value] += rr(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.NDCG.value] += ndcg(
recommended_items_current_cutoff,
relevant_items,
relevance=self.get_user_test_ratings(user_id),
at=cutoff)
results_current_cutoff[
EvaluatorMetrics.HIT_RATE.
value] += is_relevant_current_cutoff.sum()
results_current_cutoff[
EvaluatorMetrics.ARHR.value] += arhr(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.NOVELTY.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_GINI.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.SHANNON_ENTROPY.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_ITEM.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_USER.
value].add_recommendations(
recommended_items_current_cutoff, user_id)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_MEAN_INTER_LIST.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_HERFINDAHL.
value].add_recommendations(
recommended_items_current_cutoff)
if EvaluatorMetrics.DIVERSITY_SIMILARITY.value in results_current_cutoff:
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_SIMILARITY.
value].add_recommendations(
recommended_items_current_cutoff)
if time.time(
) - start_time_print > 30 or n_users_evaluated == len(
self.usersToEvaluate):
print(
"SequentialEvaluator: Processed {} ( {:.2f}% ) in {:.2f} seconds. Users per second: {:.0f}"
.format(
n_users_evaluated,
100.0 * float(n_users_evaluated) /
len(self.usersToEvaluate),
time.time() - start_time,
float(n_users_evaluated) /
(time.time() - start_time)))
sys.stdout.flush()
sys.stderr.flush()
start_time_print = time.time()
return results_dict, n_users_evaluated
def evaluateRecommender(self, recommender_object):
"""
:param recommender_object: the trained recommender object, a Recommender subclass
:param URM_test_list: list of URMs to test the recommender against, or a single URM object
:param cutoff_list: list of cutoffs to be use to report the scores, or a single cutoff
"""
results_dict = {}
for cutoff in self.cutoff_list:
results_dict[cutoff] = create_empty_metrics_dict(
self.n_items, self.n_users, recommender_object.URM_train,
self.ignore_items_ID, self.ignore_users_ID, cutoff,
self.diversity_object)
start_time = time.time()
start_time_print = time.time()
n_eval = 0
self.__all_items = np.arange(0, self.n_items, dtype=np.int)
self.__all_items = set(self.__all_items)
if self.ignore_items_flag:
recommender_object.set_items_to_ignore(self.ignore_items_ID)
for test_user in self.usersToEvaluate:
# Being the URM CSR, the indices are the non-zero column indexes
relevant_items = self.get_user_relevant_items(test_user)
n_eval += 1
self.user_specific_remove_items(recommender_object, test_user)
# recommended_items = recommender_object.recommend(np.array(test_user), remove_seen_flag=self.exclude_seen,
# cutoff = self.max_cutoff, remove_top_pop_flag=False, remove_CustomItems_flag=self.ignore_items_flag)
recommended_items = recommender_object.recommend(
np.atleast_1d(test_user),
remove_seen_flag=self.exclude_seen,
cutoff=self.max_cutoff,
remove_top_pop_flag=False,
remove_CustomItems_flag=self.ignore_items_flag)
recommended_items = np.array(recommended_items[0])
recommender_object.reset_items_to_ignore()
is_relevant = np.in1d(recommended_items,
relevant_items,
assume_unique=True)
for cutoff in self.cutoff_list:
results_current_cutoff = results_dict[cutoff]
is_relevant_current_cutoff = is_relevant[0:cutoff]
recommended_items_current_cutoff = recommended_items[0:cutoff]
results_current_cutoff[
EvaluatorMetrics.ROC_AUC.value] += roc_auc(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.PRECISION.value] += precision(
is_relevant_current_cutoff, len(relevant_items))
results_current_cutoff[
EvaluatorMetrics.RECALL.value] += recall(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.RECALL_TEST_LEN.
value] += recall_min_test_len(
is_relevant_current_cutoff,
relevant_items)
results_current_cutoff[EvaluatorMetrics.MAP.value] += map(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.MRR.value] += rr(
is_relevant_current_cutoff)
results_current_cutoff[EvaluatorMetrics.NDCG.value] += ndcg(
recommended_items_current_cutoff,
relevant_items,
relevance=self.get_user_test_ratings(test_user),
at=cutoff)
results_current_cutoff[
EvaluatorMetrics.HIT_RATE.
value] += is_relevant_current_cutoff.sum()
results_current_cutoff[EvaluatorMetrics.ARHR.value] += arhr(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.NOVELTY.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_GINI.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[EvaluatorMetrics.SHANNON_ENTROPY.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_ITEM.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_USER.value].add_recommendations(
recommended_items_current_cutoff, test_user)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_MEAN_INTER_LIST.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[EvaluatorMetrics.DIVERSITY_HERFINDAHL.
value].add_recommendations(
recommended_items_current_cutoff)
if EvaluatorMetrics.DIVERSITY_SIMILARITY.value in results_current_cutoff:
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_SIMILARITY.
value].add_recommendations(
recommended_items_current_cutoff)
if time.time() - start_time_print > 30 or n_eval == len(
self.usersToEvaluate):
print(
"SequentialEvaluator: Processed {} ( {:.2f}% ) in {:.2f} seconds. Users per second: {:.0f}"
.format(n_eval,
100.0 * float(n_eval) / len(self.usersToEvaluate),
time.time() - start_time,
float(n_eval) / (time.time() - start_time)))
sys.stdout.flush()
sys.stderr.flush()
start_time_print = time.time()
if (n_eval > 0):
for cutoff in self.cutoff_list:
results_current_cutoff = results_dict[cutoff]
for key in results_current_cutoff.keys():
value = results_current_cutoff[key]
if isinstance(value, Metrics_Object):
results_current_cutoff[key] = value.get_metric_value()
else:
results_current_cutoff[key] = value / n_eval
precision_ = results_current_cutoff[
EvaluatorMetrics.PRECISION.value]
recall_ = results_current_cutoff[EvaluatorMetrics.RECALL.value]
if precision_ + recall_ != 0:
results_current_cutoff[EvaluatorMetrics.F1.value] = 2 * (
precision_ * recall_) / (precision_ + recall_)
else:
print(
"WARNING: No users had a sufficient number of relevant items")
if self.ignore_items_flag:
recommender_object.reset_items_to_ignore()
results_run_string = self.get_result_string(results_dict)
return (results_dict, results_run_string)
def _run_evaluation_on_selected_users(self, recommender_object,
usersToEvaluate):
start_time = time.time()
start_time_print = time.time()
results_dict = {}
for cutoff in self.cutoff_list:
results_dict[cutoff] = create_empty_metrics_dict(
self.n_items, self.n_users, recommender_object.URM_train,
self.ignore_items_ID, self.ignore_users_ID, cutoff,
self.diversity_object)
n_users_evaluated = 0
for test_user in usersToEvaluate:
# Being the URM CSR, the indices are the non-zero column indexes
relevant_items = self.get_user_relevant_items(test_user)
n_users_evaluated += 1
recommended_items = recommender_object.recommend(
test_user,
remove_seen_flag=self.exclude_seen,
cutoff=self.max_cutoff,
remove_top_pop_flag=False,
remove_CustomItems_flag=self.ignore_items_flag)
is_relevant = np.in1d(recommended_items,
relevant_items,
assume_unique=True)
for cutoff in self.cutoff_list:
results_current_cutoff = results_dict[cutoff]
is_relevant_current_cutoff = is_relevant[0:cutoff]
recommended_items_current_cutoff = recommended_items[0:cutoff]
results_current_cutoff[
EvaluatorMetrics.ROC_AUC.value] += roc_auc(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.PRECISION.value] += precision(
is_relevant_current_cutoff, len(relevant_items))
results_current_cutoff[
EvaluatorMetrics.RECALL.value] += recall(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.RECALL_TEST_LEN.
value] += recall_min_test_len(
is_relevant_current_cutoff,
relevant_items)
results_current_cutoff[EvaluatorMetrics.MAP.value] += map(
is_relevant_current_cutoff, relevant_items)
results_current_cutoff[EvaluatorMetrics.MRR.value] += rr(
is_relevant_current_cutoff)
results_current_cutoff[EvaluatorMetrics.NDCG.value] += ndcg(
recommended_items_current_cutoff,
relevant_items,
relevance=self.get_user_test_ratings(test_user),
at=cutoff)
results_current_cutoff[
EvaluatorMetrics.HIT_RATE.
value] += is_relevant_current_cutoff.sum()
results_current_cutoff[EvaluatorMetrics.ARHR.value] += arhr(
is_relevant_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.NOVELTY.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_GINI.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[EvaluatorMetrics.SHANNON_ENTROPY.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_ITEM.value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[
EvaluatorMetrics.COVERAGE_USER.value].add_recommendations(
recommended_items_current_cutoff, test_user)
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_MEAN_INTER_LIST.
value].add_recommendations(
recommended_items_current_cutoff)
results_current_cutoff[EvaluatorMetrics.DIVERSITY_HERFINDAHL.
value].add_recommendations(
recommended_items_current_cutoff)
if EvaluatorMetrics.DIVERSITY_SIMILARITY.value in results_current_cutoff:
results_current_cutoff[
EvaluatorMetrics.DIVERSITY_SIMILARITY.
value].add_recommendations(
recommended_items_current_cutoff)
if time.time() - start_time_print > 30 or n_users_evaluated == len(
self.usersToEvaluate):
print(
"SequentialEvaluator: Processed {} ( {:.2f}% ) in {:.2f} seconds. Users per second: {:.0f}"
.format(
n_users_evaluated, 100.0 * float(n_users_evaluated) /
len(self.usersToEvaluate),
time.time() - start_time,
float(n_users_evaluated) / (time.time() - start_time)))
sys.stdout.flush()
sys.stderr.flush()
start_time_print = time.time()
return results_dict, n_users_evaluated