import gc import numpy as np import pandas as pd import xgboost as xgb from sklearn.cross_validation import StratifiedKFold from sklearn.metrics import matthews_corrcoef from operator import itemgetter NROWS = 2000000000 CHUNKSIZE = 50000 DATA_DIR = "../input/" def mcc(tp, tn, fp, fn): sup = tp * tn - fp * fn inf = (tp + fp) * (tp + fn) * (tn + fp) * (tn + fn) if inf == 0: return 0 else: return sup / np.sqrt(inf) def eval_mcc(y_true, y_prob, show=False): idx = np.argsort(y_prob) y_true_sort = y_true[idx] n = y_true.shape[0] nump = 1.0 * np.sum(y_true) # number of positive numn = n - nump # number of negative tp = nump tn = 0.0 fp = numn fn = 0.0 best_mcc = 0.0 best_id = -1 mccs = np.zeros(n) for i in range(n): if y_true_sort[i] == 1: tp -= 1.0 fn += 1.0 else: fp -= 1.0 tn += 1.0 new_mcc = mcc(tp, tn, fp, fn) mccs[i] = new_mcc if new_mcc >= best_mcc: best_mcc = new_mcc best_id = i if show: best_proba = y_prob[idx[best_id]] y_pred = (y_prob > best_proba).astype(int) return best_proba, best_mcc, y_pred else: return best_mcc def mcc_eval(y_prob, dtrain): y_true = dtrain.get_label() best_mcc = eval_mcc(y_true, y_prob) return 'MCC', best_mcc def create_feature_map(features): outfile = open('xgb.fmap', 'w') for i, feat in enumerate(features): outfile.write('{0}\t{1}\tq\n'.format(i, feat)) outfile.close() def get_importance(gbm, features): create_feature_map(features) importance = gbm.get_fscore(fmap='xgb.fmap') importance = sorted(importance.items(), key=itemgetter(1), reverse=True) return importance def LeaveOneOut(data1, data2, columnName, useLOO=False): grpOutcomes = data1.groupby(columnName)['Response'].mean().reset_index() grpCount = data1.groupby(columnName)['Response'].count().reset_index() grpOutcomes['cnt'] = grpCount.Response if(useLOO): grpOutcomes = grpOutcomes[grpOutcomes.cnt > 1] grpOutcomes.drop('cnt', inplace=True, axis=1) outcomes = data2['Response'].values x = pd.merge(data2[[columnName, 'Response']], grpOutcomes, suffixes=('x_', ''), how='left', on=columnName, left_index=True)['Response'] if(useLOO): x = ((x*x.shape[0])-outcomes)/(x.shape[0]-1) # x = x + np.random.normal(0, .01, x.shape[0]) return x.fillna(x.mean()) def GrabData(): trainfiles = [DATA_DIR + 'train_categorical.csv', DATA_DIR + 'train_date.csv', 'train_ex.csv', DATA_DIR + 'train_numeric.csv'] testfiles = [DATA_DIR + 'test_categorical.csv', DATA_DIR + 'test_date.csv', 'test_ex.csv', DATA_DIR + 'test_numeric.csv'] cols = [['Id', 'L1_S24_F1559', 'L3_S32_F3851', 'L1_S24_F1827', 'L1_S24_F1582', 'L3_S32_F3854', 'L1_S24_F1510', 'L1_S24_F1525'], ['Id', 'L3_S30_D3496', 'L3_S30_D3506', 'L3_S30_D3501', 'L3_S30_D3516', 'L3_S30_D3511', 'L3_S32_D3852', 'L3_S33_D3856'], ['Id', 'StartTime', 'FinishTime', 'Duration', '0_¯\_(ツ)_/¯_1','0_¯\_(ツ)_/¯_2', '0_¯\_(ツ)_/¯_3','0_¯\_(ツ)_/¯_4'], ['Id', 'L1_S24_F1846', 'L3_S32_F3850', 'L1_S24_F1695', 'L1_S24_F1632', 'L3_S33_F3855', 'L1_S24_F1604', 'L3_S29_F3407', 'L3_S33_F3865', 'L3_S38_F3952', 'L1_S24_F1723', 'Response']] traindata = None testdata = None for i, f in enumerate(trainfiles): print(f) subset = None nrows = 0 for i, chunk in enumerate(pd.read_csv(f, usecols=cols[i], chunksize=CHUNKSIZE, low_memory=False)): #print(i) if subset is None: subset = chunk.copy() else: subset = pd.concat([subset, chunk]) del chunk gc.collect() nrows += CHUNKSIZE if nrows >= NROWS: break if traindata is None: traindata = subset.copy() else: traindata = pd.merge(traindata, subset.copy(), on="Id") del subset gc.collect() del cols[3][-1] # Test doesn't have response! for i, f in enumerate(testfiles): print(f) subset = None nrows = 0 for i, chunk in enumerate(pd.read_csv(f, usecols=cols[i], chunksize=CHUNKSIZE, low_memory=False)): #print(i) if subset is None: subset = chunk.copy() else: subset = pd.concat([subset, chunk]) del chunk gc.collect() nrows += CHUNKSIZE if nrows >= NROWS: break if testdata is None: testdata = subset.copy() else: testdata = pd.merge(testdata, subset.copy(), on="Id") del subset gc.collect() testdata['Response'] = 0 # Add Dummy Value visibletraindata = traindata[::2] blindtraindata = traindata[1::2] print(blindtraindata.columns) for i in range(3): for col in cols[i][1:]: print(col) blindtraindata.loc[:, col] = LeaveOneOut(visibletraindata, blindtraindata, col, False).values testdata.loc[:, col] = LeaveOneOut(visibletraindata, testdata, col, False).values del visibletraindata gc.collect() testdata.drop('Response', inplace=True, axis=1) return blindtraindata, testdata def Train(): train, test = GrabData() print('Train:', train.shape) print('Test', test.shape) features = train.columns[1:-1] print(features) num_rounds = 44 response1 = train[train.Response == 1].shape[0] response0 = train.shape[0] - response1 scale_pos_weight = float(response1 / response0) print("Response1 = {0}".format(response1)) print("Response0 = {0}".format(response0)) print("scale_pos_weight = {0}".format(scale_pos_weight)) params = {} params['objective'] = "binary:logistic" params['eta'] = 0.021 params['max_depth'] = 28 params['colsample_bytree'] = 0.999 params['subsample'] = 0.999999 params['min_child_weight'] = 3 params['base_score'] = 0.0047 params['silent'] = True #params['scale_pos_weight'] = scale_pos_weight print('Fitting') trainpredictions = None testpredictions = None dvisibletrain = xgb.DMatrix(train[features], train.Response, silent=True) dtest = xgb.DMatrix(test[features], silent=True) folds = 1 for i in range(folds): print('Fold:', i) params['seed'] = i watchlist = [(dvisibletrain, 'train'), (dvisibletrain, 'val')] clf = xgb.train(params, dvisibletrain, num_boost_round=num_rounds, evals=watchlist, early_stopping_rounds=20, feval=mcc_eval, maximize=True ) limit = clf.best_iteration+1 # limit = clf.best_ntree_limit predictions = \ clf.predict(dvisibletrain, ntree_limit=limit) best_proba, best_mcc, y_pred = eval_mcc(train.Response, predictions, True) print('tree limit:', limit) print('mcc:', best_mcc) print(matthews_corrcoef(train.Response, y_pred)) if(trainpredictions is None): trainpredictions = predictions else: trainpredictions += predictions predictions = clf.predict(dtest, ntree_limit=limit) if(testpredictions is None): testpredictions = predictions else: testpredictions += predictions imp = get_importance(clf, features) print('Importance array: ', imp) best_proba, best_mcc, y_pred = eval_mcc(train.Response, trainpredictions/folds, True) print(matthews_corrcoef(train.Response, y_pred)) pd.DataFrame({"Id": test.Id.values, "Response": (testpredictions/folds > .08).astype(int)}).to_csv( 'xgbsubmission08.csv', index=False) pd.DataFrame({"Id": test.Id.values, "Response": (testpredictions/folds > .09).astype(int)}).to_csv( 'xgbsubmission09.csv', index=False) pd.DataFrame({"Id": test.Id.values, "Response": (testpredictions/folds > .1).astype(int)}).to_csv( 'xgbsubmission10.csv', index=False) pd.DataFrame({"Id": test.Id.values, "Response": (testpredictions/folds > .2).astype(int)}).to_csv( 'xgbsubmission20.csv', index=False) pd.DataFrame({"Id": test.Id.values, "Response": (testpredictions/folds > .3).astype(int)}).to_csv( 'xgbsubmission30.csv', index=False) if __name__ == "__main__": print('Started') ID_COLUMN = 'Id' TARGET_COLUMN = 'Response' TRAIN_NUMERIC = "{0}train_numeric.csv".format(DATA_DIR) TRAIN_DATE = "{0}train_date.csv".format(DATA_DIR) TEST_NUMERIC = "{0}test_numeric.csv".format(DATA_DIR) TEST_DATE = "{0}test_date.csv".format(DATA_DIR) train = pd.read_csv(TRAIN_NUMERIC, usecols=[ID_COLUMN, TARGET_COLUMN], nrows=NROWS) test = pd.read_csv(TEST_NUMERIC, usecols=[ID_COLUMN], nrows=NROWS) train["StartTime"] = -1 test["StartTime"] = -1 train["FinishTime"] = -1 test["FinishTime"] = -1 train["Duration"] = -1 test["Duration"] = -1 nrows = 0 for tr, te in zip(pd.read_csv(TRAIN_DATE, chunksize=CHUNKSIZE), pd.read_csv(TEST_DATE, chunksize=CHUNKSIZE)): feats = np.setdiff1d(tr.columns, [ID_COLUMN]) stime_tr = tr[feats].min(axis=1).values stime_te = te[feats].min(axis=1).values train.loc[train.Id.isin(tr.Id), 'StartTime'] = stime_tr test.loc[test.Id.isin(te.Id), 'StartTime'] = stime_te ftime_tr = tr[feats].max(axis=1).values ftime_te = te[feats].max(axis=1).values train.loc[train.Id.isin(tr.Id), 'FinishTime'] = ftime_tr test.loc[test.Id.isin(te.Id), 'FinishTime'] = ftime_te duration_tr = ftime_tr - stime_tr duration_te = ftime_te - stime_te train.loc[train.Id.isin(tr.Id), 'Duration'] = duration_tr test.loc[test.Id.isin(te.Id), 'Duration'] = duration_te del tr del te gc.collect() nrows += CHUNKSIZE if nrows >= NROWS: break ntrain = train.shape[0] train_test = pd.concat((train, test)).reset_index(drop=True).reset_index(drop=False) train_test['0_¯\_(ツ)_/¯_1'] = train_test[ID_COLUMN].diff().fillna(9999999).astype(int) train_test['0_¯\_(ツ)_/¯_2'] = train_test[ID_COLUMN].iloc[::-1].diff().fillna(9999999).astype(int) train_test = train_test.sort_values(by=['StartTime', 'Id'], ascending=True) train_test['0_¯\_(ツ)_/¯_3'] = train_test[ID_COLUMN].diff().fillna(9999999).astype(int) train_test['0_¯\_(ツ)_/¯_4'] = train_test[ID_COLUMN].iloc[::-1].diff().fillna(9999999).astype(int) train_test = train_test.sort_values(by=['index']).drop(['index'], axis=1) train = train_test.iloc[:ntrain, :] test = train_test.iloc[ntrain:, :] train.to_csv('train_ex.csv', Index=False) test.drop(['Response'], axis = 1, inplace = True, errors = 'ignore') test.to_csv('test_ex.csv', Index=False) del train del test del train_test gc.collect() Train() print('Finished')