Kaggle competition: Riiid Answer Correctness Prediction
<SOS> metric: AUC Kaggle data source: riiid-answer-correctness-prediction<save_model>
import pandas as pd
import numpy as np
import gc
from sklearn.metrics import roc_auc_score
from collections import defaultdict
from tqdm.notebook import tqdm
import lightgbm as lgb
import riiideducation
import matplotlib.pyplot as plt
import seaborn as sns
import random
import os
learn.save('stage-4' )<train_model>
SEED = 123
def seed_everything(seed):
random.seed(seed)
 np.random.seed(seed)
 os.environ['PYTHONHASHSEED'] = str(seed)
 seed_everything(SEED)
 def add_features(df, answered_correctly_u_count, answered_correctly_u_sum, elapsed_time_u_sum, explanation_u_sum, timestamp_u, timestamp_u_incorrect, answered_correctly_q_count, answered_correctly_q_sum, elapsed_time_q_sum, explanation_q_sum, answered_correctly_uq, update = True):
answered_correctly_u_avg = np.zeros(len(df), dtype = np.float32)
 elapsed_time_u_avg = np.zeros(len(df), dtype = np.float32)
 explanation_u_avg = np.zeros(len(df), dtype = np.float32)
 timestamp_u_recency_1 = np.zeros(len(df), dtype = np.float32)
 timestamp_u_recency_2 = np.zeros(len(df), dtype = np.float32)
 timestamp_u_recency_3 = np.zeros(len(df), dtype = np.float32)
 timestamp_u_incorrect_recency = np.zeros(len(df), dtype = np.float32)
 answered_correctly_q_avg = np.zeros(len(df), dtype = np.float32)
 elapsed_time_q_avg = np.zeros(len(df), dtype = np.float32)
 explanation_q_avg = np.zeros(len(df), dtype = np.float32)
 answered_correctly_uq_count = np.zeros(len(df), dtype = np.int32)
 for num, row in enumerate(df[['user_id', 'answered_correctly', 'content_id', 'prior_question_elapsed_time', 'prior_question_had_explanation', 'timestamp']].values):
if answered_correctly_u_count[row[0]] != 0:
answered_correctly_u_avg[num] = answered_correctly_u_sum[row[0]] / answered_correctly_u_count[row[0]]
elapsed_time_u_avg[num] = elapsed_time_u_sum[row[0]] / answered_correctly_u_count[row[0]]
explanation_u_avg[num] = explanation_u_sum[row[0]] / answered_correctly_u_count[row[0]]
else:
answered_correctly_u_avg[num] = np.nan
elapsed_time_u_avg[num] = np.nan
explanation_u_avg[num] = np.nan
if len(timestamp_u[row[0]])== 0:
timestamp_u_recency_1[num] = np.nan
timestamp_u_recency_2[num] = np.nan
timestamp_u_recency_3[num] = np.nan
elif len(timestamp_u[row[0]])== 1:
timestamp_u_recency_1[num] = row[5] - timestamp_u[row[0]][0]
timestamp_u_recency_2[num] = np.nan
timestamp_u_recency_3[num] = np.nan
elif len(timestamp_u[row[0]])== 2:
timestamp_u_recency_1[num] = row[5] - timestamp_u[row[0]][1]
timestamp_u_recency_2[num] = row[5] - timestamp_u[row[0]][0]
timestamp_u_recency_3[num] = np.nan
elif len(timestamp_u[row[0]])== 3:
timestamp_u_recency_1[num] = row[5] - timestamp_u[row[0]][2]
timestamp_u_recency_2[num] = row[5] - timestamp_u[row[0]][1]
timestamp_u_recency_3[num] = row[5] - timestamp_u[row[0]][0]
if len(timestamp_u_incorrect[row[0]])== 0:
timestamp_u_incorrect_recency[num] = np.nan
else:
timestamp_u_incorrect_recency[num] = row[5] - timestamp_u_incorrect[row[0]][0]
if answered_correctly_q_count[row[2]] != 0:
answered_correctly_q_avg[num] = answered_correctly_q_sum[row[2]] / answered_correctly_q_count[row[2]]
elapsed_time_q_avg[num] = elapsed_time_q_sum[row[2]] / answered_correctly_q_count[row[2]]
explanation_q_avg[num] = explanation_q_sum[row[2]] / answered_correctly_q_count[row[2]]
else:
answered_correctly_q_avg[num] = np.nan
elapsed_time_q_avg[num] = np.nan
explanation_q_avg[num] = np.nan
answered_correctly_uq_count[num] = answered_correctly_uq[row[0]][row[2]]
answered_correctly_u_count[row[0]] += 1
elapsed_time_u_sum[row[0]] += row[3]
explanation_u_sum[row[0]] += int(row[4])
 if len(timestamp_u[row[0]])== 3:
timestamp_u[row[0]].pop(0)
 timestamp_u[row[0]].append(row[5])
 else:
timestamp_u[row[0]].append(row[5])
 answered_correctly_q_count[row[2]] += 1
elapsed_time_q_sum[row[2]] += row[3]
explanation_q_sum[row[2]] += int(row[4])
 answered_correctly_uq[row[0]][row[2]] += 1
if update:
answered_correctly_u_sum[row[0]] += row[1]
if row[1] == 0:
if len(timestamp_u_incorrect[row[0]])== 1:
timestamp_u_incorrect[row[0]].pop(0)
 timestamp_u_incorrect[row[0]].append(row[5])
 else:
timestamp_u_incorrect[row[0]].append(row[5])
 answered_correctly_q_sum[row[2]] += row[1]
user_df = pd.DataFrame({'answered_correctly_u_avg': answered_correctly_u_avg, 'elapsed_time_u_avg': elapsed_time_u_avg, 'explanation_u_avg': explanation_u_avg,
'answered_correctly_q_avg': answered_correctly_q_avg, 'elapsed_time_q_avg': elapsed_time_q_avg, 'explanation_q_avg': explanation_q_avg,
'answered_correctly_uq_count': answered_correctly_uq_count, 'timestamp_u_recency_1': timestamp_u_recency_1, 'timestamp_u_recency_2': timestamp_u_recency_2,
'timestamp_u_recency_3': timestamp_u_recency_3, 'timestamp_u_incorrect_recency': timestamp_u_incorrect_recency})
 df = pd.concat([df, user_df], axis = 1)
 return df
def update_features(df, answered_correctly_u_sum, answered_correctly_q_sum, timestamp_u_incorrect):
for row in df[['user_id', 'answered_correctly', 'content_id', 'content_type_id', 'timestamp']].values:
if row[3] == 0:
answered_correctly_u_sum[row[0]] += row[1]
if row[1] == 0:
if len(timestamp_u_incorrect[row[0]])== 1:
timestamp_u_incorrect[row[0]].pop(0)
 timestamp_u_incorrect[row[0]].append(row[4])
 else:
timestamp_u_incorrect[row[0]].append(row[4])
 answered_correctly_q_sum[row[2]] += row[1]
return
def read_and_preprocess(feature_engineering = False):
train_pickle = '.. /input/riiid-cross-validation-files/cv1_train.pickle'
valid_pickle = '.. /input/riiid-cross-validation-files/cv1_valid.pickle'
question_file = '.. /input/riiid-test-answer-prediction/questions.csv'
feld_needed = ['timestamp', 'user_id', 'answered_correctly', 'content_id', 'content_type_id', 'prior_question_elapsed_time', 'prior_question_had_explanation']
train = pd.read_pickle(train_pickle)[feld_needed]
valid = pd.read_pickle(valid_pickle)[feld_needed]
if feature_engineering:
train = train.iloc[-40000000:]
train = train.loc[train.content_type_id == False].reset_index(drop = True)
 valid = valid.loc[valid.content_type_id == False].reset_index(drop = True)
 train['prior_question_had_explanation'] = train.prior_question_had_explanation.fillna(False ).astype('int8')
 valid['prior_question_had_explanation'] = valid.prior_question_had_explanation.fillna(False ).astype('int8')
 prior_question_elapsed_time_mean = train['prior_question_elapsed_time'].dropna().mean()
train['prior_question_elapsed_time'].fillna(prior_question_elapsed_time_mean, inplace = True)
 valid['prior_question_elapsed_time'].fillna(prior_question_elapsed_time_mean, inplace = True)
 questions_df = pd.read_csv(question_file)
 questions_df['part'] = questions_df['part'].astype(np.int32)
 questions_df['bundle_id'] = questions_df['bundle_id'].astype(np.int32)
 train = pd.merge(train, questions_df[['question_id', 'part']], left_on = 'content_id', right_on = 'question_id', how = 'left')
 valid = pd.merge(valid, questions_df[['question_id', 'part']], left_on = 'content_id', right_on = 'question_id', how = 'left')
 answered_correctly_u_count = defaultdict(int)
 answered_correctly_u_sum = defaultdict(int)
 elapsed_time_u_sum = defaultdict(int)
 explanation_u_sum = defaultdict(int)
 timestamp_u = defaultdict(list)
 timestamp_u_incorrect = defaultdict(list)
 answered_correctly_q_count = defaultdict(int)
 answered_correctly_q_sum = defaultdict(int)
 elapsed_time_q_sum = defaultdict(int)
 explanation_q_sum = defaultdict(int)
 answered_correctly_uq = defaultdict(lambda: defaultdict(int))
print('User feature calculation started...')
 print('
')
 train = add_features(train, answered_correctly_u_count, answered_correctly_u_sum, elapsed_time_u_sum, explanation_u_sum, timestamp_u, timestamp_u_incorrect, answered_correctly_q_count, answered_correctly_q_sum, elapsed_time_q_sum, explanation_q_sum, answered_correctly_uq)
 valid = add_features(valid, answered_correctly_u_count, answered_correctly_u_sum, elapsed_time_u_sum, explanation_u_sum, timestamp_u, timestamp_u_incorrect, answered_correctly_q_count, answered_correctly_q_sum, elapsed_time_q_sum, explanation_q_sum, answered_correctly_uq)
 gc.collect()
print('User feature calculation completed...')
 print('
')
 features_dicts = {
'answered_correctly_u_count': answered_correctly_u_count,
'answered_correctly_u_sum': answered_correctly_u_sum,
'elapsed_time_u_sum': elapsed_time_u_sum,
'explanation_u_sum': explanation_u_sum,
'answered_correctly_q_count': answered_correctly_q_count,
'answered_correctly_q_sum': answered_correctly_q_sum,
'elapsed_time_q_sum': elapsed_time_q_sum,
'explanation_q_sum': explanation_q_sum,
'answered_correctly_uq': answered_correctly_uq,
'timestamp_u': timestamp_u,
'timestamp_u_incorrect': timestamp_u_incorrect
}
return train, valid, questions_df, prior_question_elapsed_time_mean, features_dicts
def train_and_evaluate(train, valid, feature_engineering = False):
TARGET = 'answered_correctly'
FEATURES = ['prior_question_elapsed_time', 'prior_question_had_explanation', 'part', 'answered_correctly_u_avg', 'elapsed_time_u_avg', 'explanation_u_avg',
'answered_correctly_q_avg', 'elapsed_time_q_avg', 'explanation_q_avg', 'answered_correctly_uq_count', 'timestamp_u_recency_1', 'timestamp_u_recency_2', 'timestamp_u_recency_3',
'timestamp_u_incorrect_recency']
if feature_engineering:
train = train.sample(15000000, random_state = SEED)
 gc.collect()
print(f'Traning with {train.shape[0]} rows and {len(FEATURES)} features')
 drop_cols = list(set(train.columns)- set(FEATURES))
y_train = train[TARGET]
y_val = valid[TARGET]
train.drop(drop_cols, axis = 1, inplace = True)
 valid.drop(drop_cols, axis = 1, inplace = True)
 gc.collect()
lgb_train = lgb.Dataset(train[FEATURES], y_train)
 lgb_valid = lgb.Dataset(valid[FEATURES], y_val)
 del train, y_train
gc.collect()
params = {'objective': 'binary',
'seed': SEED,
'metric': 'auc',
'num_leaves': 200,
'feature_fraction': 0.75,
'bagging_freq': 10,
'bagging_fraction': 0.80
}
model = lgb.train(
 params = params,
train_set = lgb_train,
num_boost_round = 10000,
valid_sets = [lgb_train, lgb_valid],
early_stopping_rounds = 10,
verbose_eval = 50 
)
 print('Our Roc Auc score for the validation data is:', roc_auc_score(y_val, model.predict(valid[FEATURES])))
 feature_importance = model.feature_importance()
feature_importance = pd.DataFrame({'Features': FEATURES, 'Importance': feature_importance} ).sort_values('Importance', ascending = False)
 fig = plt.figure(figsize =(10, 10))
fig.suptitle('Feature Importance', fontsize = 20)
 plt.tick_params(axis = 'x', labelsize = 12)
 plt.tick_params(axis = 'y', labelsize = 12)
 plt.xlabel('Importance', fontsize = 15)
 plt.ylabel('Features', fontsize = 15)
 sns.barplot(x = feature_importance['Importance'], y = feature_importance['Features'], orient = 'h')
 plt.show()
return TARGET, FEATURES, model
def inference(TARGET, FEATURES, model, questions_df, prior_question_elapsed_time_mean, features_dicts):
answered_correctly_u_count = features_dicts['answered_correctly_u_count']
answered_correctly_u_sum = features_dicts['answered_correctly_u_sum']
elapsed_time_u_sum = features_dicts['elapsed_time_u_sum']
explanation_u_sum = features_dicts['explanation_u_sum']
answered_correctly_q_count = features_dicts['answered_correctly_q_count']
answered_correctly_q_sum = features_dicts['answered_correctly_q_sum']
elapsed_time_q_sum = features_dicts['elapsed_time_q_sum']
explanation_q_sum = features_dicts['explanation_q_sum']
answered_correctly_uq = features_dicts['answered_correctly_uq']
timestamp_u = features_dicts['timestamp_u']
timestamp_u_incorrect = features_dicts['timestamp_u_incorrect']
env = riiideducation.make_env()
iter_test = env.iter_test()
set_predict = env.predict
previous_test_df = None
for(test_df, sample_prediction_df)in iter_test:
if previous_test_df is not None:
previous_test_df[TARGET] = eval(test_df["prior_group_answers_correct"].iloc[0])
 update_features(previous_test_df, answered_correctly_u_sum, answered_correctly_q_sum, timestamp_u_incorrect)
 previous_test_df = test_df.copy()
test_df = test_df[test_df['content_type_id'] == 0].reset_index(drop = True)
 test_df['prior_question_had_explanation'] = test_df.prior_question_had_explanation.fillna(False ).astype('int8')
 test_df['prior_question_elapsed_time'].fillna(prior_question_elapsed_time_mean, inplace = True)
 test_df = pd.merge(test_df, questions_df[['question_id', 'part']], left_on = 'content_id', right_on = 'question_id', how = 'left')
 test_df[TARGET] = 0
test_df = add_features(test_df, answered_correctly_u_count, answered_correctly_u_sum, elapsed_time_u_sum, explanation_u_sum, timestamp_u, timestamp_u_incorrect, answered_correctly_q_count, answered_correctly_q_sum, elapsed_time_q_sum, explanation_q_sum, answered_correctly_uq, update = False)
 test_df[TARGET] = model.predict(test_df[FEATURES])
 set_predict(test_df[['row_id', TARGET]])
 print('Job Done')
 train, valid, questions_df, prior_question_elapsed_time_mean, features_dicts = read_and_preprocess(feature_engineering = True)
 TARGET, FEATURES, model = train_and_evaluate(train, valid, feature_engineering = True)
 inference(TARGET, FEATURES, model, questions_df, prior_question_elapsed_time_mean, features_dicts )