Kaggle competition: TGS Salt Identification Challenge
<SOS> metric: IntersectionOverUnionObjectSegmentation Kaggle data source: tgs-salt-identification-challenge<prepare_x_and_y>
plt.style.use('seaborn-white')
 sns.set_style("white")
 %matplotlib inline
t_start = time.time()
FEATURES = ["vendor_id","passenger_count","pickup_longitude", "pickup_latitude", "dropoff_longitude","dropoff_latitude","distance","month","hour","day"]
TARGET = "trip_duration"
X_train = df_train[FEATURES]
y_train = df_train[TARGET]<create_dataframe>
version = 5
basic_name = f'Unet_resnet_v{version}'
save_model_name = basic_name + '.model'
submission_file = basic_name + '.csv'
print(save_model_name)
 print(submission_file )
lgb_train = lgb.Dataset(X_train,y_train )<init_hyperparams>
img_size_ori = 101
img_size_target = 101
def upsample(img):
if img_size_ori == img_size_target:
return img
return resize(img,(img_size_target, img_size_target), mode='constant', preserve_range=True)
 def downsample(img):
if img_size_ori == img_size_target:
return img
return resize(img,(img_size_ori, img_size_ori), mode='constant', preserve_range=True )
lgb_params = {
'learning_rate': 0.1,
'max_depth': 25,
'num_leaves': 1000,
'objective': 'regression',
'feature_fraction': 0.9,
'bagging_fraction': 0.5,
'max_bin': 1000}<train_model>
train_df = pd.read_csv(".. /input/train.csv", index_col="id", usecols=[0])
 depths_df = pd.read_csv(".. /input/depths.csv", index_col="id")
 train_df = train_df.join(depths_df)
 test_df = depths_df[~depths_df.index.isin(train_df.index)]
len(train_df )
model_lgb = lgb.train(lgb_params,lgb_train,num_boost_round=500 )<compute_train_metric>
train_df["images"] = [np.array(load_img(".. /input/train/images/{}.png".format(idx), grayscale=True)) / 255 for idx in tqdm_notebook(train_df.index)]
cv_score = lgb.cv(
 lgb_params,
lgb_train,
num_boost_round=100,
nfold=3,
metrics='mae',
early_stopping_rounds=10,
stratified=False
)<compute_test_metric>
train_df["masks"] = [np.array(load_img(".. /input/train/masks/{}.png".format(idx), grayscale=True)) / 255 for idx in tqdm_notebook(train_df.index)]
print('Best CV score:', cv_score['l1-mean'][-1] )<predict_on_test>
train_df["coverage"] = train_df.masks.map(np.sum)/ pow(img_size_ori, 2)
 def cov_to_class(val):
for i in range(0, 11):
if val * 10 <= i :
return i
train_df["coverage_class"] = train_df.coverage.map(cov_to_class)
X_prediction = df_test[FEATURES]
prediction = np.exp(model_lgb.predict(X_prediction))
prediction<save_to_csv>
ids_train, ids_valid, x_train, x_valid, y_train, y_valid, cov_train, cov_test, depth_train, depth_test = train_test_split(
 train_df.index.values,
np.array(train_df.images.map(upsample ).tolist() ).reshape(-1, img_size_target, img_size_target, 1),
np.array(train_df.masks.map(upsample ).tolist() ).reshape(-1, img_size_target, img_size_target, 1),
train_df.coverage.values,
train_df.z.values,
test_size=0.2, stratify=train_df.coverage_class, random_state= 1234 )
submission = pd.DataFrame({'id': df_test.id, 'trip_duration': prediction})
 submission.to_csv('submission.csv', index=False )<set_options>
def BatchActivate(x):
x = BatchNormalization()(x)
 x = Activation('relu' )(x)
 return x
def convolution_block(x, filters, size, strides=(1,1), padding='same', activation=True):
x = Conv2D(filters, size, strides=strides, padding=padding )(x)
 if activation == True:
x = BatchActivate(x)
 return x
def residual_block(blockInput, num_filters=16, batch_activate = False):
x = BatchActivate(blockInput)
 x = convolution_block(x, num_filters,(3,3))
x = convolution_block(x, num_filters,(3,3), activation=False)
 x = Add()([x, blockInput])
 if batch_activate:
x = BatchActivate(x)
 return x
%matplotlib inline<load_from_csv>
def build_model(input_layer, start_neurons, DropoutRatio = 0.4):
conv1 = Conv2D(start_neurons * 1,(3, 3), activation=None, padding="same" )(input_layer)
 conv1 = residual_block(conv1,start_neurons * 1)
 conv1 = residual_block(conv1,start_neurons * 1, True)
 pool1 = MaxPooling2D(( 2, 2))(conv1)
 pool1 = Dropout(DropoutRatio/2 )(pool1)
 conv2 = Conv2D(start_neurons * 2,(3, 3), activation=None, padding="same" )(pool1)
 conv2 = residual_block(conv2,start_neurons * 2)
 conv2 = residual_block(conv2,start_neurons * 2, True)
 pool2 = MaxPooling2D(( 2, 2))(conv2)
 pool2 = Dropout(DropoutRatio )(pool2)
 conv3 = Conv2D(start_neurons * 4,(3, 3), activation=None, padding="same" )(pool2)
 conv3 = residual_block(conv3,start_neurons * 4)
 conv3 = residual_block(conv3,start_neurons * 4, True)
 pool3 = MaxPooling2D(( 2, 2))(conv3)
 pool3 = Dropout(DropoutRatio )(pool3)
 conv4 = Conv2D(start_neurons * 8,(3, 3), activation=None, padding="same" )(pool3)
 conv4 = residual_block(conv4,start_neurons * 8)
 conv4 = residual_block(conv4,start_neurons * 8, True)
 pool4 = MaxPooling2D(( 2, 2))(conv4)
 pool4 = Dropout(DropoutRatio )(pool4)
 convm = Conv2D(start_neurons * 16,(3, 3), activation=None, padding="same" )(pool4)
 convm = residual_block(convm,start_neurons * 16)
 convm = residual_block(convm,start_neurons * 16, True)
 deconv4 = Conv2DTranspose(start_neurons * 8,(3, 3), strides=(2, 2), padding="same" )(convm)
 uconv4 = concatenate([deconv4, conv4])
 uconv4 = Dropout(DropoutRatio )(uconv4)
 uconv4 = Conv2D(start_neurons * 8,(3, 3), activation=None, padding="same" )(uconv4)
 uconv4 = residual_block(uconv4,start_neurons * 8)
 uconv4 = residual_block(uconv4,start_neurons * 8, True)
 deconv3 = Conv2DTranspose(start_neurons * 4,(3, 3), strides=(2, 2), padding="valid" )(uconv4)
 uconv3 = concatenate([deconv3, conv3])
 uconv3 = Dropout(DropoutRatio )(uconv3)
 uconv3 = Conv2D(start_neurons * 4,(3, 3), activation=None, padding="same" )(uconv3)
 uconv3 = residual_block(uconv3,start_neurons * 4)
 uconv3 = residual_block(uconv3,start_neurons * 4, True)
 deconv2 = Conv2DTranspose(start_neurons * 2,(3, 3), strides=(2, 2), padding="same" )(uconv3)
 uconv2 = concatenate([deconv2, conv2])
 uconv2 = Dropout(DropoutRatio )(uconv2)
 uconv2 = Conv2D(start_neurons * 2,(3, 3), activation=None, padding="same" )(uconv2)
 uconv2 = residual_block(uconv2,start_neurons * 2)
 uconv2 = residual_block(uconv2,start_neurons * 2, True)
 deconv1 = Conv2DTranspose(start_neurons * 1,(3, 3), strides=(2, 2), padding="valid" )(uconv2)
 uconv1 = concatenate([deconv1, conv1])
 uconv1 = Dropout(DropoutRatio )(uconv1)
 uconv1 = Conv2D(start_neurons * 1,(3, 3), activation=None, padding="same" )(uconv1)
 uconv1 = residual_block(uconv1,start_neurons * 1)
 uconv1 = residual_block(uconv1,start_neurons * 1, True)
 output_layer_noActi = Conv2D(1,(1,1), padding="same", activation=None )(uconv1)
 output_layer = Activation('sigmoid' )(output_layer_noActi)
 return output_layer
df = pd.read_csv(".. /input/train.csv")
 test = pd.read_csv(".. /input/test.csv" )<count_duplicates>
def get_iou_vector(A, B):
batch_size = A.shape[0]
metric = []
for batch in range(batch_size):
t, p = A[batch]>0, B[batch]>0
intersection = np.logical_and(t, p)
 union = np.logical_or(t, p)
 iou =(np.sum(intersection > 0)+ 1e-10)/(np.sum(union > 0)+ 1e-10)
 thresholds = np.arange(0.5, 1, 0.05)
 s = []
for thresh in thresholds:
s.append(iou > thresh)
 metric.append(np.mean(s))
return np.mean(metric)
 def my_iou_metric(label, pred):
return tf.py_func(get_iou_vector, [label, pred>0.5], tf.float64)
 def my_iou_metric_2(label, pred):
return tf.py_func(get_iou_vector, [label, pred >0], tf.float64 )
df.duplicated().sum()<count_missing_values>
def lovasz_grad(gt_sorted):

 gts = tf.reduce_sum(gt_sorted)
 intersection = gts - tf.cumsum(gt_sorted)
 union = gts + tf.cumsum(1.- gt_sorted)
 jaccard = 1.- intersection / union
jaccard = tf.concat(( jaccard[0:1], jaccard[1:] - jaccard[:-1]), 0)
 return jaccard
def lovasz_hinge(logits, labels, per_image=True, ignore=None):

 if per_image:
def treat_image(log_lab):
log, lab = log_lab
log, lab = tf.expand_dims(log, 0), tf.expand_dims(lab, 0)
 log, lab = flatten_binary_scores(log, lab, ignore)
 return lovasz_hinge_flat(log, lab)
 losses = tf.map_fn(treat_image,(logits, labels), dtype=tf.float32)
 loss = tf.reduce_mean(losses)
 else:
loss = lovasz_hinge_flat(*flatten_binary_scores(logits, labels, ignore))
return loss
def lovasz_hinge_flat(logits, labels):

 def compute_loss() :
labelsf = tf.cast(labels, logits.dtype)
 signs = 2.* labelsf - 1.
 errors = 1.- logits * tf.stop_gradient(signs)
 errors_sorted, perm = tf.nn.top_k(errors, k=tf.shape(errors)[0], name="descending_sort")
 gt_sorted = tf.gather(labelsf, perm)
 grad = lovasz_grad(gt_sorted)
 loss = tf.tensordot(tf.nn.relu(errors_sorted), tf.stop_gradient(grad), 1, name="loss_non_void")
 return loss
loss = tf.cond(tf.equal(tf.shape(logits)[0], 0),
lambda: tf.reduce_sum(logits)* 0.,
compute_loss,
strict=True,
name="loss" 
)
 return loss
def flatten_binary_scores(scores, labels, ignore=None):

 scores = tf.reshape(scores,(-1,))
labels = tf.reshape(labels,(-1,))
if ignore is None:
return scores, labels
valid = tf.not_equal(labels, ignore)
 vscores = tf.boolean_mask(scores, valid, name='valid_scores')
 vlabels = tf.boolean_mask(labels, valid, name='valid_labels')
 return vscores, vlabels
def lovasz_loss(y_true, y_pred):
y_true, y_pred = K.cast(K.squeeze(y_true, -1), 'int32'), K.cast(K.squeeze(y_pred, -1), 'float32')
 logits = y_pred
loss = lovasz_hinge(logits, y_true, per_image = True, ignore = None)
 return loss
df.isna().sum()<filter>
x_train = np.append(x_train, [np.fliplr(x)for x in x_train], axis=0)
 y_train = np.append(y_train, [np.fliplr(x)for x in y_train], axis=0)
 print(x_train.shape)
 print(y_valid.shape )
df = df[(df.trip_duration < 5900)]<filter>
input_layer = Input(( img_size_target, img_size_target, 1))
output_layer = build_model(input_layer, 16,0.5)
 model1 = Model(input_layer, output_layer)
 c = optimizers.adam(lr = 0.01)
 model1.compile(loss="binary_crossentropy", optimizer=c, metrics=[my_iou_metric])
df = df[(df.passenger_count > 0)]<filter>
model_checkpoint = ModelCheckpoint(save_model_name,monitor='my_iou_metric',
mode = 'max', save_best_only=True, verbose=1)
 reduce_lr = ReduceLROnPlateau(monitor='my_iou_metric', mode = 'max',factor=0.6, patience=5, min_lr=0.0001, verbose=1)
 epochs = 50
batch_size = 32
history = model1.fit(x_train, y_train,
validation_data=[x_valid, y_valid],
epochs=epochs,
batch_size=batch_size,
callbacks=[ model_checkpoint,reduce_lr],
verbose=2 )
df = df[(df.pickup_longitude > -100)]
df = df[(df.pickup_latitude < 50)] 
<categorify>
model1 = load_model(save_model_name,custom_objects={'my_iou_metric': my_iou_metric})
 input_x = model1.layers[0].input
output_layer = model1.layers[-1].input
model = Model(input_x, output_layer)
 c = optimizers.adam(lr = 0.01)
 model.compile(loss=lovasz_loss, optimizer=c, metrics=[my_iou_metric_2])
df = pd.concat([df, pd.get_dummies(df['store_and_fwd_flag'])], axis=1)
 test = pd.concat([test, pd.get_dummies(test['store_and_fwd_flag'])], axis=1)
 df.drop(['store_and_fwd_flag'], axis=1, inplace=True)
 df = pd.concat([df, pd.get_dummies(df['vendor_id'])], axis=1)
 test = pd.concat([test, pd.get_dummies(test['vendor_id'])], axis=1)
 df.drop(['vendor_id'], axis=1, inplace=True )<feature_engineering>
early_stopping = EarlyStopping(monitor='val_my_iou_metric_2', mode = 'max',patience=20, verbose=1)
 model_checkpoint = ModelCheckpoint(save_model_name,monitor='val_my_iou_metric_2',
mode = 'max', save_best_only=True, verbose=1)
 reduce_lr = ReduceLROnPlateau(monitor='val_my_iou_metric_2', mode = 'max',factor=0.6, patience=5, min_lr=0.0001, verbose=1)
 epochs = 50
batch_size = 32
history = model.fit(x_train, y_train,
validation_data=[x_valid, y_valid],
epochs=epochs,
batch_size=batch_size,
callbacks=[ model_checkpoint,reduce_lr,early_stopping],
verbose=2 )
df['pickup_datetime'] = pd.to_datetime(df.pickup_datetime)
 test['pickup_datetime'] = pd.to_datetime(test.pickup_datetime)
 df.drop(['dropoff_datetime'], axis=1, inplace=True)
 df['month'] = df.pickup_datetime.dt.month
df['week'] = df.pickup_datetime.dt.week
df['weekday'] = df.pickup_datetime.dt.weekday
df['hour'] = df.pickup_datetime.dt.hour
df['minute'] = df.pickup_datetime.dt.minute
df['minute_oftheday'] = df['hour'] * 60 + df['minute']
df.drop(['minute'], axis=1, inplace=True)
 test['month'] = test.pickup_datetime.dt.month
test['week'] = test.pickup_datetime.dt.week
test['weekday'] = test.pickup_datetime.dt.weekday
test['hour'] = test.pickup_datetime.dt.hour
test['minute'] = test.pickup_datetime.dt.minute
test['minute_oftheday'] = test['hour'] * 60 + test['minute']
test.drop(['minute'], axis=1, inplace=True)
 df.drop(['pickup_datetime'], axis=1, inplace=True)
 df.info()<compute_test_metric>
model = load_model(save_model_name,custom_objects={'my_iou_metric_2': my_iou_metric_2,
'lovasz_loss': lovasz_loss})
def ft_haversine_distance(lat1, lng1, lat2, lng2):
lat1, lng1, lat2, lng2 = map(np.radians,(lat1, lng1, lat2, lng2))
AVG_EARTH_RADIUS = 6371
lat = lat2 - lat1
lng = lng2 - lng1
d = np.sin(lat * 0.5)** 2 + np.cos(lat1)* np.cos(lat2)* np.sin(lng * 0.5)** 2
h = 2 * AVG_EARTH_RADIUS * np.arcsin(np.sqrt(d))
return h
df['distance'] = ft_haversine_distance(df['pickup_latitude'].values,
df['pickup_longitude'].values,
df['dropoff_latitude'].values,
df['dropoff_longitude'].values)
 test['distance'] = ft_haversine_distance(test['pickup_latitude'].values,
test['pickup_longitude'].values,
test['dropoff_latitude'].values,
test['dropoff_longitude'].values )<feature_engineering>
def predict_result(model,x_test,img_size_target):
x_test_reflect = np.array([np.fliplr(x)for x in x_test])
 preds_test = model.predict(x_test ).reshape(-1, img_size_target, img_size_target)
 preds_test2_refect = model.predict(x_test_reflect ).reshape(-1, img_size_target, img_size_target)
 preds_test += np.array([ np.fliplr(x)for x in preds_test2_refect])
 return preds_test/2
def ft_degree(lat1, lng1, lat2, lng2):
AVG_EARTH_RADIUS = 6371
lng_delta_rad = np.radians(lng2 - lng1)
 lat1, lng1, lat2, lng2 = map(np.radians,(lat1, lng1, lat2, lng2))
y = np.sin(lng_delta_rad)* np.cos(lat2)
 x = np.cos(lat1)* np.sin(lat2)- np.sin(lat1)* np.cos(lat2)* np.cos(lng_delta_rad)
 return np.degrees(np.arctan2(y, x))
df['direction'] = ft_degree(df['pickup_latitude'].values,
df['pickup_longitude'].values,
df['dropoff_latitude'].values,
df['dropoff_longitude'].values)
 test['direction'] = ft_degree(test['pickup_latitude'].values,
test['pickup_longitude'].values,
test['dropoff_latitude'].values,
test['dropoff_longitude'].values )<filter>
preds_valid = predict_result(model,x_valid,img_size_target )
df = df[(df.distance < 200)]<feature_engineering>
thresholds_ori = np.linspace(0.3, 0.7, 31)
 thresholds = np.log(thresholds_ori/(1-thresholds_ori))
ious = np.array([iou_metric_batch(y_valid, preds_valid > threshold)for threshold in tqdm_notebook(thresholds)])
 print(ious )
df['speed'] = df.distance / df.trip_duration<drop_column>

 def rle_encode(im):

 pixels = im.flatten(order = 'F')
 pixels = np.concatenate([[0], pixels, [0]])
 runs = np.where(pixels[1:] != pixels[:-1])[0] + 1
runs[1::2] -= runs[::2]
return ' '.join(str(x)for x in runs )
df = df[(df.speed < 30)]
df.drop(['speed'], axis=1, inplace=True )<prepare_x_and_y>
preds_test = predict_result(model,x_test,img_size_target )
y = df["trip_duration"]
df.drop(["trip_duration"], axis=1, inplace=True)
 df.drop(['id'], axis=1, inplace=True)
 X = df
X.shape, y.shape<split>
sub = pd.DataFrame.from_dict(pred_dict,orient='index')
 sub.index.names = ['id']
sub.columns = ['rle_mask']
sub.to_csv(submission_file )
<import_modules><EOS> 
t_finish = time.time()
print(f"Kernel run time = {(t_finish-t_start)/3600} hours" )