def NB(X, y, X_ind, y_ind):
"""Cross Validation and independent set test for Naive Bayes.
Arguments:
X (ndarray): Feature data of training and validation set for cross-validation.
m X n matrix, m is the No. of samples, n is the No. of fetures
y (ndarray): Label data of training and validation set for cross-validation.
m-D vector, and m is the No. of samples.
X_ind (ndarray): Feature data of independent test set for independent test.
It has the similar data structure as X.
y_ind (ndarray): Feature data of independent set for for independent test.
It has the similar data structure as y
out (str): The file path for saving the result data.
Returns:
cvs (ndarray): cross-validation results. The shape is (m, ), m is the No. of samples.
inds (ndarray): independent test results. It has similar data structure as cvs.
"""
folds = StratifiedKFold(5).split(X, y)
cvs = np.zeros(y.shape)
inds = np.zeros(y_ind.shape)
for i, (trained, valided) in enumerate(folds):
model = GaussianNB()
model.fit(X[trained], y[trained])
cvs[valided] = model.predict_proba(X[valided])[:, 1]
inds += model.predict_proba(X_ind)[:, 1]
return cvs, inds / 5
def evaluate(model, dataloader, device):
model.eval()
probas = []
labels = []
# compute metrics over the dataset
with torch.no_grad():
for i, (batch_inputs, batch_labels) in enumerate(tqdm(dataloader)):
# move to GPU if available
batch_inputs = batch_inputs.to(device)
batch_labels = batch_labels.to(device) # shape: (batch_size,)
# predict softmax probabilities
batch_probas = model.predict_proba(
batch_inputs) # shape: (batch_size, 2)
# collect predictions
probas.append(to_np(batch_probas))
labels.append(to_np(batch_labels))
probas = np.vstack(probas)
labels = np.concatenate(labels)
# compute all metrics after one epoch
metrics = {
"loss": log_loss(labels, probas[:, 1]),
"accuracy": accuracy_score(labels, probas.argmax(1)),
"AUC": roc_auc_score(labels, probas[:, 1])
}
return metrics
def SVM(X, y, X_ind, y_ind, is_reg=False):
"""Cross Validation and independent set test for Support Vector Machine (SVM)
Arguments:
X (ndarray): Feature data of training and validation set for cross-validation.
m X n matrix, m is the No. of samples, n is the No. of fetures
y (ndarray): Label data of training and validation set for cross-validation.
m-D vector, and m is the No. of samples.
X_ind (ndarray): Feature data of independent test set for independent test.
It has the similar data structure as X.
y_ind (ndarray): Feature data of independent set for for independent test.
It has the similar data structure as y
out (str): The file path for saving the result data.
is_reg (bool, optional): define the model for regression (True) or classification (False) (Default: False)
Returns:
cvs (ndarray): cross-validation results. The shape is (m, ), m is the No. of samples.
inds (ndarray): independent test results. It has similar data structure as cvs.
"""
if is_reg:
folds = KFold(5).split(X)
model = SVR()
else:
folds = StratifiedKFold(5).split(X, y)
model = SVC(probability=True)
cvs = np.zeros(y.shape)
inds = np.zeros(y_ind.shape)
gs = GridSearchCV(model, {
'C': 2.0**np.array([-5, 15]),
'gamma': 2.0**np.array([-15, 5])
},
n_jobs=5)
gs.fit(X, y)
params = gs.best_params_
print(params)
for i, (trained, valided) in enumerate(folds):
model = SVC(probability=True, C=params['C'], gamma=params['gamma'])
model.fit(X[trained], y[trained])
if is_reg:
cvs[valided] = model.predict(X[valided])
inds += model.predict(X_ind)
else:
cvs[valided] = model.predict_proba(X[valided])[:, 1]
inds += model.predict_proba(X_ind)[:, 1]
return cvs, inds / 5
def task():
year, months = 2019, [10, 11, 12]
select = None
radius, aperture_size, incident_interval, time_step = '100', '6', '25', '1'
config = {
'year': year,
'months': months,
'radius': radius,
'aperture_size': aperture_size,
'incident_interval': incident_interval,
'time_step': time_step,
'select': select
}
month = months[0]
df = pd.read_pickle(
f'output/waze/{year}_{month}_{radius}_{aperture_size}_features.pkl')
for month in months[1:]:
temp_df = pd.read_pickle(
f'output/waze/{year}_{month}_{radius}_{aperture_size}_features.pkl'
)
df = df.append(temp_df, sort=False)
df.fillna(0, inplace=True)
# if select is not None:
# df = df[-1 * int(select):]
if os.path.exists(
f'output/{year}_{month}_{radius}_{aperture_size}_predict_proba.pkl'
):
x = pd.read_pickle(
f'output/{year}_{month}_{radius}_{aperture_size}_predict_proba.pkl'
)
else:
x = model.predict_proba(df, int(incident_interval), time_step)
x = model.extract_features(x, df)
x.to_pickle(
f'output/{year}_{month}_{radius}_{aperture_size}_predict_proba.pkl'
)
incident_df = load_incidents(aperture_size)
if os.path.exists(f'output/{year}_{month}_{radius}_{aperture_size}_y.pkl'):
y = pd.read_pickle(
f'output/{year}_{month}_{radius}_{aperture_size}_y.pkl')
else:
y = label_mapper(x, incident_df)
pd.Series(y).to_pickle(
f'output/{year}_{month}_{radius}_{aperture_size}_y.pkl')
models = [
'LogisticRegression', 'DecisionTreeClassifier',
'RandomForestClassifier'
]
for m in models:
print('model', m)
cv_results, y_pred = model.cross_validate(x, y, m)
for k, v in config.items():
print(k, ',', v)
for k, v in cv_results.items():
print(k, ',', np.average(v))
print()
def score_and_predict(model, X, Y):
'''
Given a binary classification model, predict output classification for numpy features `X`
and evaluate accuracy against labels `Y`. Labels should be numpy array of 0s and 1s.
Returns (accuracy, numpy array of classification probabilities)
'''
probs = model.predict_proba(X)[:, 1]
clf = probs > .5
accuracy = (np.squeeze(Y) == np.squeeze(clf)).mean()
return accuracy, probs
def find_text_in_frame(current_img, baseimgs, modelfile='webapp/model.pickle',proba_threshold = 0.5, debug=False):
blobs = []
for baseimg in baseimgs:
for (xmin,ymin), blob in img_proc_utils.extract_blobs(current_img-baseimg, img_proc_pipeline = img_proc_utils.pipeline_otsu):
proba = model.predict_proba(blob, model=modelfile)
if proba >= proba_threshold or debug:
blobs.append({'blob': blob, 'left_corner': [xmin,ymin], 'proba': proba})
if len(blobs) > 0 and not debug:
return blobs
return blobs
def RF(X, y, X_ind, y_ind, is_reg=False):
"""Cross Validation and independent set test for Random Forest model
Arguments:
X (ndarray): Feature data of training and validation set for cross-validation.
m X n matrix, m is the No. of samples, n is the No. of fetures
y (ndarray): Label data of training and validation set for cross-validation.
m-D vector, and m is the No. of samples.
X_ind (ndarray): Feature data of independent test set for independent test.
It has the similar data structure as X.
y_ind (ndarray): Feature data of independent set for for independent test.
It has the similar data structure as y
out (str): The file path for saving the result data.
is_reg (bool, optional): define the model for regression (True) or classification (False) (Default: False)
Returns:
cvs (ndarray): cross-validation results. The shape is (m, ), m is the No. of samples.
inds (ndarray): independent test results. It has similar data structure as cvs.
"""
if is_reg:
folds = KFold(5).split(X)
alg = RandomForestRegressor
else:
folds = StratifiedKFold(5).split(X, y)
alg = RandomForestClassifier
cvs = np.zeros(y.shape)
inds = np.zeros(y_ind.shape)
for i, (trained, valided) in enumerate(folds):
model = alg(n_estimators=500, n_jobs=1)
model.fit(X[trained], y[trained])
if is_reg:
cvs[valided] = model.predict(X[valided])
inds += model.predict(X_ind)
else:
cvs[valided] = model.predict_proba(X[valided])[:, 1]
inds += model.predict_proba(X_ind)[:, 1]
return cvs, inds / 5
def temporal(model, batch, y_preds, num_classes, device):
inputs, lengths = batch
new_preds = torch.zeros(inputs.shape)
losses = torch.zeros(inputs.shape)
for i in range(inputs.shape[0]):
preinputs = inputs[:i + 1, :]
with torch.no_grad():
new_lengths = torch.min(lengths, torch.tensor(i + 1).to(device))
preout = model.predict_proba((preinputs, new_lengths))
new_preds[i, :] = preout.gather(1, y_preds).squeeze()
losses[0, :] = new_preds[0, :] - 1.0 / num_classes
for i in range(1, inputs.shape[0]):
losses[i, :] = new_preds[i, :] - new_preds[i - 1, :]
return losses
def temporal_tail(model, batch, y_preds, num_classes, device):
inputs, lengths = batch
new_preds = torch.zeros(inputs.shape)
losses = torch.zeros(inputs.shape)
for i in range(inputs.shape[0]):
postinputs = inputs[i:, :]
with torch.no_grad():
new_lengths = torch.max(lengths - i, torch.tensor(1).to(device))
postout = model.predict_proba((postinputs, new_lengths))
new_preds[i, :] = postout.gather(1, y_preds).squeeze()
losses[-1, :] = new_preds[-1, :] - 1.0 / num_classes
for i in range(inputs.shape[0] - 1):
losses[i, :] = new_preds[i, :] - new_preds[i + 1, :]
return losses
def get(self):
# use parser and find the user's query
args = parser.parse_args()
user_query = args['query']
# vectorize the user's query and make a prediction
uq_vectorized = model.vectorizer_transform(np.array([user_query]))
prediction = model.predict(uq_vectorized)
pred_proba = model.predict_proba(uq_vectorized)
# round the predict proba value and set to new variable
confidence = round(pred_proba[0], 3)
# create JSON object
output = {'intent': prediction.item(0), 'probability': str(confidence)}
return output
def get(self):
# use parser and find the user's query
args = parser.parse_args()
user_query = args['query']
# preprocessing the user's query and make a prediction
uq_preprocess = model.numericalImputer_transform(np.array([user_query]))
prediction = model.predict(uq_preprocess)
pred_proba = model.predict_proba(uq_preprocess)
# round the predict proba value and set to new variable
confidence = round(pred_proba[0], 3)
# create JSON object
output = {'prediction': str(prediction), 'probability': confidence}
return output
def word_drop(model, batch, y_preds, num_classes, device):
inputs = batch[0]
losses = torch.zeros(inputs.shape)
target = None
for i in range(inputs.shape[0]):
if target:
index, vals = target
inputs[i - 1, :] = vals
target = (i, torch.clone(inputs[i, :]))
inputs[i, :] = 0
with torch.no_grad():
out = model.predict_proba(batch)
losses[i, :] = out.gather(1, y_preds).squeeze()
if target:
index, vals = target
inputs[-1, :] = vals
return 1. - losses
def stream_frames2(stream, pafy_video = None):
base_frame_sec = -1
base_frame = None
test = (pafy_video == None)
# stream = '/windows/mit/rubakov.mp4' # testing
if base_frame < 0:
if pafy_video:
yield 'event: onstart\ndata: %s\n\n' % json.dumps({'video_length': pafy_video.length,
'video_title': pafy_video.title,
# 'video_desc': pafy_video.description,
'video_author': pafy_video.author})
else:
yield 'event: onstart\ndata: %s\n\n' % json.dumps({'video_length': 5000})
try:
for sec, frame in utils.get_frames_from_stream(stream,5):
if int(sec % 20) == 0:
yield 'event: onprogress\ndata: %s\n\n' % json.dumps({'sec': int(sec)})
if base_frame_sec < 0:
base_frame = frame
base_frame_sec = sec
continue
if test: has_blob = False
for (xmin,ymin), blob in img_proc_utils.extract_blobs(frame-base_frame, img_proc_pipeline = img_proc_utils.pipeline2):
proba = model.predict_proba(blob, model='webapp/model.pickle')
if proba > 0.5:
has_blob = True
print sec, xmin, ymin,proba
yield 'data: %s\n\n' % json.dumps({'img': utils.img_to_base64_bytes(blob), #utils.img_to_base64_bytes(255-np.nan_to_num(abs(blob))),
'sec': int(sec),
'proba': proba,
'left_corner': [xmin,ymin],
'size': blob.shape,
'frame': utils.img_to_base64_bytes(frame)
})
base_frame = frame
base_frame_sec = sec
if test and has_blob: time.sleep(3)
except StopIteration:
print 'onend!'
yield 'event: onend\ndata: end\n\n'
raise StopIteration
def get(self):
features = self.parser.parse_args()
# control all required features are passed.
# create pandas dataframe
row = args_to_pandas(features)
# drop useless features (ids)
# to_drop = []
df = row[columns]
# clean & transform dataset
df = api_feature_transformation(df)
# make positive (fraud) probability prediction
model, prediction, model_cols = predict_proba(df)
# get feature contributions (force to 1 row)
contributions = get_feature_contributions(model, df[model_cols])
# return json
return {
"Prediction": round(prediction, 4),
"Impact": contributions,
}, 200
def predict(year, month, radius, aperture_size, incident_interval, time_step,
select):
config = {
'year': year,
'month': month,
'radius': radius,
'aperture_size': aperture_size,
'incident_interval': incident_interval,
'time_step': time_step,
'select': select
}
df = pd.read_pickle(
f'output/waze/{year}_{month}_{radius}_{aperture_size}_features.pkl')
if select is not None:
df = df[-1 * int(select):]
x = model.predict_proba(df, int(incident_interval), time_step)
incident_df = load_incidents(aperture_size)
y = label_mapper(x, incident_df)
print(np.unique(y, return_counts=True))
cv_results = model.cross_validate(x, y)
for k, v in config.items():
print(k, v)
for k, v in cv_results.items():
print(k, np.average(v))
def step(self, X_test, iteration):
####################################### Hardcoded sequences of actions ####################################################
if iteration == 1: # as fast as possible
X_train, X_test = make_inference(self.se_extractor,
self.X,
X_test,
self.device,
max_len=3,
num_eval=1)
model = LogisticRegression(solver='lbfgs',
multi_class='multinomial',
max_iter=20)
model.fit(X_train, self.y.argmax(axis=1))
y_pred = model.predict_proba(X_test)
self.predictions.append((1, 'first', y_pred))
self.features['se_3_1'] = (X_train, X_test)
return
if iteration == 2:
# schedule a non-blocking op
self.data_id = ray.put((self.X, self.y, X_test, self.cv))
self.X_music = ray.remote(
num_gpus=0.25, num_cpus=1,
max_calls=1)(extract_musicnn_features).remote(self.data_id)
self.predictions.clear()
X_tr, X_t = self.features['se_3_1']
model = LogisticRegression(solver='lbfgs',
multi_class='multinomial',
max_iter=100)
score, y_pred = fit_single(None, model, self.cv, X_tr, self.y, X_t,
self.metric)
self.predictions.append((score, 'first', y_pred))
module_path = f'{self.root_path}/3rdparty/autospeech19/'
self.solution3_2019 = ray.remote(
num_gpus=0.25, num_cpus=1,
max_calls=1)(top3_2019_kon).remote(module_path,
self.out_path_top3_2019,
self.n_classes,
self.data_id, self.metric)
module_path = f'{self.root_path}/3rdparty/AutoSpeech/code_submission'
self.solution1_2019 = ray.remote(
num_gpus=0.25, num_cpus=1,
max_calls=1)(top1_2019_hazza_cheng).remote(
module_path, self.out_path_top1_2019, self.n_classes,
self.data_id, self.metric)
if iteration == 3:
X_train, X_test = make_inference(self.se_extractor,
self.X,
X_test,
self.device,
max_len=5,
num_eval=5)
self.features['se_5_5'] = (X_train.mean(axis=1),
X_test.mean(axis=1))
X_train = X_train.transpose(1, 0, 2).reshape(
(-1, X_train.shape[-1]))
self.features['se_5_5_expand'] = (X_train, X_test.mean(axis=1))
if iteration == 10:
X_train, X_test = make_inference(self.se_extractor,
self.X,
X_test,
self.device,
max_len=10,
num_eval=5)
self.features['se_10_5'] = (X_train.mean(axis=1),
X_test.mean(axis=1))
if iteration == 15:
X_train, X_test = make_inference(self.se_extractor,
self.X,
X_test,
self.device,
max_len=15,
num_eval=5)
self.features['se_15_5'] = (X_train.mean(axis=1),
X_test.mean(axis=1))
if iteration == 20:
X_train, X_test = make_inference(self.se_extractor,
self.X,
X_test,
self.device,
max_len=10,
num_eval=10)
self.features['se_10_10'] = (X_train.mean(axis=1),
X_test.mean(axis=1))
##################################### Check for external results ############################################################
try: # TODO add interprocess filelock (concurrent read/write)
for root_path in [
self.out_path_top1_2019, self.out_path_top3_2019
]:
ext_paths = glob.glob(root_path + '/*.pkl.lzma')
for path in ext_paths:
score, y_pred = joblib.load(path)
name = os.path.basename(path).split('.')[0]
name = f'{os.path.dirname(path)}_{name}'
names = set([x[1] for x in self.predictions])
if name in names:
continue
print('extresult', score, name)
self.predictions.append((score, name, y_pred))
except:
pass
########################################### Train a model #########################################################
# Check whether the futures are ready
if 'mg' not in self.features:
ready, nready = ray.wait([self.X_music], timeout=0.1)
if ready:
X_tr, X_te = ray.get(self.X_music)
X_tr = time_pooling(X_tr, 'mean')
X_te = time_pooling(X_te, 'mean')
assert len(X_tr.shape) == 2 and len(X_te.shape) == 2
print('>' * 400, 'MG ready')
self.features['mg'] = (X_tr, X_te)
self.pm.start(self.data_id,
time_budget=TIME_BUDGET,
seconds_per_step=10,
max_t=5,
reduction_factor=4)
# Select candidates to train
candidates = []
for model_suf in ['standartize', 'normalize', 'noop', 'sign_sqrt']:
for fname in self.features:
out_name = f'{fname}_{model_suf}'
if out_name in self.features_completed:
continue
candidates.append((model_suf, fname, out_name))
# Train random candidate
if candidates and np.random.rand() < 0.8: # sometimes skip this step
r_idx = np.random.randint(0, len(candidates))
model_suf, fname, out_name = candidates[r_idx]
prep = ClassDesc(Preprocessor, model_suf)
X_train, X_test = self.features[fname]
max_iter = 100 if len(X_train) < 1500 else 30
model = LogisticRegression(solver='lbfgs',
multi_class='multinomial',
max_iter=max_iter)
score, y_pred = fit_single(prep, model, self.cv, X_train, self.y,
X_test)
self.features_completed.add(out_name)
self.predictions.append((score, out_name, y_pred))
return # one model per iteration
if self.pm.executor is not None:
pm_results = self.pm.executor.get_results()[0]
if pm_results:
pm_results = list(sorted(pm_results,
key=lambda x: -x['score']))
pm_top_score = pm_results[0]['score']
top_predictions = list(
sorted(self.predictions, key=lambda x: -x[0]))
if pm_top_score > top_predictions[0][0] - 0.03:
refit_seconds = 10 if self.iteration < 30 else 20
y_pred = self.pm.predict(X_test,
refit_seconds=refit_seconds)
name = f'pm_{pm_top_score}'
if len(pm_results) > 1:
pm_top2_score = pm_results[1]['score']
name = f'pm_{pm_top_score}_{pm_top2_score}'
self.predictions.append((pm_top_score, name, y_pred))
if 'mg' in self.features:
X1_train, X1_test = self.features['mg']
for model_suf in ['standartize', 'normalize', 'noop', 'sign_sqrt']:
for fname in self.features:
if 'expand' in fname:
continue
out_name = f'mg_{fname}_fus_{model_suf}'
if out_name in self.features_completed:
continue
X2_train, X2_test = self.features[fname]
pre = ClassDesc(Preprocessor, model_suf)
post = ClassDesc(Preprocessor, model_suf)
fus = StaticFusion(pre, post)
X_train = fus.fit_transform(X1_train, X2_train)
X_test = fus.transform(X1_test, X2_test)
model = LogisticRegression(solver='lbfgs',
multi_class='multinomial')
score, y_pred = fit_single(None, model, self.cv, X_train,
self.y, X_test)
self.features_completed.add(out_name)
self.predictions.append((score, out_name, y_pred))
return
return 1
def one_hot(df):
df['delivery_method_1.0'] = (df['delivery_method'] == 1).astype(int)
df['delivery_method_3.0'] = (df['delivery_method'] == 3).astype(int)
df['delivery_method_nan'] = (df['delivery_method'] == np.nan).astype(int)
df['has_header_1.0'] = (df['has_header'] == 1).astype(int)
df['has_header_nan'] = (df['has_header'] == np.nan).astype(int)
df['user_type_2.0'] = (df['user_type'] == 2).astype(int)
df['user_type_3.0'] = (df['user_type'] == 3).astype(int)
df['user_type_4.0'] = (df['user_type'] == 4).astype(int)
df['user_type_5.0'] = (df['user_type'] == 5).astype(int)
df['user_type_103.0'] = (df['user_type'] == 103).astype(int)
df['user_type_nan'] = (df['user_type'] == np.nan).astype(int)
return df.drop(columns=['delivery_method', 'has_header', 'user_type'])
if __name__ == "__main__":
with open('models/LRmodel.pkl', 'rb') as f:
model = pickle.load(f)
with open('models/LRmodelScaler.pkl', 'rb') as f:
scaler = pickle.load(f)
X, y = get_example_X_y('data/test_script_examples.csv', scaler)
print(model.predict_proba(X)[np.random.randint(low=0, high=25)])
def train_logreg(trX,
trY,
vaX=None,
vaY=None,
teX=None,
teY=None,
penalty='l1',
max_iter=100,
C=2**np.arange(-8, 1).astype(np.float),
seed=42,
model=None,
eval_test=True,
neurons=None):
"""
slightly modified version of openai implementation https://github.com/openai/generating-reviews-discovering-sentiment/blob/master/utils.py
if model is not None it doesn't train the model before scoring, it just scores the model
"""
# if only integer is provided for C make it iterable so we can loop over
if not isinstance(C, collections.Iterable):
C = list([C])
# extract features for given neuron indices
if neurons is not None:
trX = trX[:, neurons]
if vaX is not None:
vaX = vaX[:, neurons]
if teX is not None:
teX = teX[:, neurons]
# Cross validation over C
scores = []
if model is None:
for i, c in enumerate(C):
model = LogisticRegression(C=c,
penalty=penalty,
max_iter=max_iter,
random_state=42 + i)
model.fit(trX, trY)
if vaX is not None:
score = model.score(vaX, vaY)
else:
score = model.score(trX, trY)
scores.append(score)
del model
c = C[np.argmax(scores)]
model = LogisticRegression(C=c,
penalty=penalty,
max_iter=max_iter,
random_state=42 + len(C))
model.fit(trX, trY)
else:
c = model.C
# predict probabilities and get accuracy of regression model on train, val, test as appropriate
# also get number of regression weights that are not zero. (number of features used for modeling)
nnotzero = np.sum(model.coef_ != 0)
scores = []
probs = []
train_score, train_probs = score_and_predict(model, trX, trY)
scores.append(train_score * 100)
probs.append(train_probs)
if vaX is None:
eval_data = trX
val_score = train_score
val_probs = train_probs
else:
eval_data = vaX
val_score, val_probs = score_and_predict(model, vaX, vaY)
scores.append(val_score * 100)
probs.append(val_probs)
eval_score = val_score
eval_probs = val_probs
if teX is not None and teY is not None:
if eval_test:
eval_score, eval_probs = score_and_predict(model, teX, teY)
else:
eval_probs = model.predict_proba(teX)[:, 1]
scores.append(eval_score * 100)
probs.append(eval_probs)
return model, scores, probs, c, nnotzero
def model(features, test_features, encoding='ohe', n_folds=5):
"""Train and test a light gradient boosting model using
cross validation.
Parameters
--------
features (pd.DataFrame):
dataframe of training features to use
for training a model. Must include the TARGET column.
test_features (pd.DataFrame):
dataframe of testing features to use
for making predictions with the model.
encoding (str, default = 'ohe'):
method for encoding categorical variables. Either 'ohe' for one-hot encoding or 'le' for integer label encoding
n_folds (int, default = 5): number of folds to use for cross validation
Return
--------
submission (pd.DataFrame):
dataframe with `SK_ID_CURR` and `TARGET` probabilities
predicted by the model.
feature_importances (pd.DataFrame):
dataframe with the feature importances from the model.
valid_metrics (pd.DataFrame):
dataframe with training and validation metrics (ROC AUC) for each fold and overall.
"""
# Extract the ids
train_ids = features['SK_ID_CURR']
test_ids = test_features['SK_ID_CURR']
# Extract the labels for training
labels = features['TARGET']
# Remove the ids and target
features = features.drop(columns=['SK_ID_CURR', 'TARGET'])
test_features = test_features.drop(columns=['SK_ID_CURR'])
# One Hot Encoding
if encoding == 'ohe':
features = pd.get_dummies(features)
test_features = pd.get_dummies(test_features)
# Align the dataframes by the columns
features, test_features = features.align(test_features,
join='inner',
axis=1)
# No categorical indices to record
cat_indices = 'auto'
# Integer label encoding
elif encoding == 'le':
# Create a label encoder
label_encoder = LabelEncoder()
# List for storing categorical indices
cat_indices = []
# Iterate through each column
for i, col in enumerate(features):
if features[col].dtype == 'object':
# Map the categorical features to integers
features[col] = label_encoder.fit_transform(
np.array(features[col].astype(str)).reshape((-1, )))
test_features[col] = label_encoder.transform(
np.array(test_features[col].astype(str)).reshape((-1, )))
# Record the categorical indices
cat_indices.append(i)
# Catch error if label encoding scheme is not valid
else:
raise ValueError("Encoding must be either 'ohe' or 'le'")
print('Training Data Shape: ', features.shape)
print('Testing Data Shape: ', test_features.shape)
# Extract feature names
feature_names = list(features.columns)
# Convert to np arrays
features = np.array(features)
test_features = np.array(test_features)
# Create the kfold object
k_fold = KFold(n_splits=n_folds, shuffle=False, random_state=50)
# Empty array for feature importances
feature_importance_values = np.zeros(len(feature_names))
# Empty array for test predictions
test_predictions = np.zeros(test_features.shape[0])
# Empty array for out of fold validation predictions
out_of_fold = np.zeros(features.shape[0])
# Lists for recording validation and training scores
valid_scores = []
train_scores = []
# Iterate through each fold
for train_indices, valid_indices in k_fold.split(features):
# Training data for the fold
train_features, train_labels = features[train_indices], labels[
train_indices]
# Validation data for the fold
valid_features, valid_labels = features[valid_indices], labels[
valid_indices]
# Create the model
model = lgb.LGBMClassifier(n_estimators=10000,
objective='binary',
class_weight='balanced',
learning_rate=0.05,
reg_alpha=0.1,
reg_lambda=0.1,
subsample=0.8,
n_jobs=-1,
random_state=50)
# Train the model
model.fit(train_features,
train_labels,
eval_metric='auc',
eval_set=[(valid_features, valid_labels),
(train_features, train_labels)],
eval_names=['valid', 'train'],
categorical_feature=cat_indices,
early_stopping_rounds=100,
verbose=200)
# Record the best iteration
best_iteration = model.best_iteration_
# Record the feature importances
feature_importance_values += model.feature_importances_ / k_fold.n_splits
# Make predictions
test_predictions += model.predict_proba(
test_features, num_iteration=best_iteration)[:,
1] / k_fold.n_splits
# Record the out of fold predictions
out_of_fold[valid_indices] = model.predict_proba(
valid_features, num_iteration=best_iteration)[:, 1]
# Record the best score
valid_score = model.best_score_['valid']['auc']
train_score = model.best_score_['train']['auc']
valid_scores.append(valid_score)
train_scores.append(train_score)
# Clean up memory
gc.enable()
del model, train_features, valid_features
gc.collect()
# Make the submission dataframe
submission = pd.DataFrame({
'SK_ID_CURR': test_ids,
'TARGET': test_predictions
})
# Make the feature importance dataframe
feature_importances = pd.DataFrame({
'feature': feature_names,
'importance': feature_importance_values
})
# Overall validation score
valid_auc = roc_auc_score(labels, out_of_fold)
# Add the overall scores to the metrics
valid_scores.append(valid_auc)
train_scores.append(np.mean(train_scores))
# Needed for creating dataframe of validation scores
fold_names = list(range(n_folds))
fold_names.append('overall')
# Dataframe of validation scores
metrics = pd.DataFrame({
'fold': fold_names,
'train': train_scores,
'valid': valid_scores
})
return submission, feature_importances, metrics
