Kaggle competition: PadhAI: Text - Non Text Classification Level 4b
<SOS> metric: categorizationaccuracy Kaggle data source: padhai:-text-non-text-classification-level-4b<define_variables>
np.random.seed(100)
 LEVEL = 'level_4b'
warnings.filterwarnings("ignore" )
cm = []
acc = []
prec = []
rec = []
f1 = []
models = []
estimators = []<compute_train_metric>
class SigmoidNeuron:
def __init__(self):
self.w = None
self.b = None
def perceptron(self, x):
return np.dot(x, self.w.T)+ self.b
def sigmoid(self, x):
return 1.0/(1.0 + np.exp(-x))
def grad_w_mse(self, x, y):
y_pred = self.sigmoid(self.perceptron(x))
return(y_pred - y)* y_pred *(1 - y_pred)* x
def grad_b_mse(self, x, y):
y_pred = self.sigmoid(self.perceptron(x))
return(y_pred - y)* y_pred *(1 - y_pred)
 def grad_w_ce(self, x, y):
y_pred = self.sigmoid(self.perceptron(x))
if y == 0:
return y_pred * x
elif y == 1:
return -1 *(1 - y_pred)* x
else:
raise ValueError("y should be 0 or 1")
 def grad_b_ce(self, x, y):
y_pred = self.sigmoid(self.perceptron(x))
if y == 0:
return y_pred
elif y == 1:
return -1 *(1 - y_pred)
 else:
raise ValueError("y should be 0 or 1")
 def fit(self, X, Y, epochs=1, learning_rate=1, initialise=True, loss_fn="mse", display_loss=False):
if initialise or self.w is None:
self.w = np.random.randn(1, X.shape[1])
 self.b = 0
if display_loss:
loss = {}
for i in tqdm_notebook(range(epochs), total=epochs, unit="epoch"):
dw = 0
db = 0
for x, y in zip(X, Y):
if loss_fn == "mse":
dw += self.grad_w_mse(x, y)
 db += self.grad_b_mse(x, y)
 elif loss_fn == "ce":
dw += self.grad_w_ce(x, y)
 db += self.grad_b_ce(x, y)
 self.w -= learning_rate * dw
self.b -= learning_rate * db
if display_loss:
Y_pred = self.sigmoid(self.perceptron(X))
if loss_fn == "mse":
loss[i] = mean_squared_error(Y, Y_pred)
 elif loss_fn == "ce":
loss[i] = log_loss(Y, Y_pred)
 if display_loss:
plt.plot(loss.values())
 plt.xlabel('Epochs')
 if loss_fn == "mse":
plt.ylabel('Mean Squared Error')
 elif loss_fn == "ce":
plt.ylabel('Log Loss')
 plt.show()
def predict(self, X):
Y_pred = []
for x in X:
y_pred = self.sigmoid(self.perceptron(x))
Y_pred.append(y_pred)
 return np.array(Y_pred )
for classfication_model in classification_models:
model = eval(classfication_model )()
model.fit(X_train,y_train)
 y_pred = model.predict(X_test)
 models.append(type(model ).__name__)
 estimators.append(( type(model ).__name__,model))
cm.append(confusion_matrix(y_test,y_pred))
acc.append(accuracy_score(y_test,y_pred))
prec.append(precision_score(y_test,y_pred))
rec.append(recall_score(y_test,y_pred))
f1.append(f1_score(y_test,y_pred))<train_model>
vc = VotingClassifier(estimators)
 vc.fit(X_train,y_train )<compute_train_metric>
languages = ['ta', 'hi', 'en']
images_train = read_all(".. /input/level_4b_train/"+LEVEL+"/"+"background", key_prefix='bgr_')
 for language in languages:
images_train.update(read_all(".. /input/level_4b_train/"+LEVEL+"/"+language, key_prefix=language+"_"))
print(len(images_train))
images_test = read_all(".. /input/level_4b_test/kaggle_"+LEVEL, key_prefix='')
 print(len(images_test))
y_pred = vc.predict(X_test)
 models.append(type(vc ).__name__)
 cm.append(confusion_matrix(y_test,y_pred))
acc.append(accuracy_score(y_test,y_pred))
prec.append(precision_score(y_test,y_pred))
rec.append(recall_score(y_test,y_pred))
f1.append(f1_score(y_test,y_pred))<define_variables>
scaler = StandardScaler()
X_scaled_train = scaler.fit_transform(X_train)
 X_scaled_test = scaler.transform(X_test )
model_dict = {"Models":models,
"CM":cm,
"Accuracy":acc,
"Precision":prec,
"Recall":rec,
"f1_score":f1}<create_dataframe>
kfold = KFold(5, True, 10)
model_df = pd.DataFrame(model_dict)
 model_df<sort_values>
sn_ce = SigmoidNeuron()
for train, test in kfold.split(X_scaled_train,Y_train):
sn_ce.fit(X_scaled_train[train], Y_train[train], epochs=500, learning_rate=0.00002, loss_fn="ce", display_loss=True,initialise=False)
 Y_pred_train = sn_ce.predict(X_scaled_train[test])
 Y_pred_binarised_train =(Y_pred_train >= 0.5 ).astype("int" ).ravel()
accuracy_train = accuracy_score(Y_pred_binarised_train, Y_train[test])
 print("Train Accuracy : ", accuracy_train)
 print("-"*50)
model_df.sort_values(by=['Accuracy','f1_score','Recall','Precision'],ascending=False,inplace=True)
 model_df<define_search_space>
def print_accuracy(sn):
Y_pred_train = sn.predict(X_scaled_train)
 Y_pred_binarised_train =(Y_pred_train >= 0.5 ).astype("int" ).ravel()
accuracy_train = accuracy_score(Y_pred_binarised_train, Y_train)
 print("Train Accuracy : ", accuracy_train)
 print("-"*50 )
model_param_grid = {}<define_search_space>
print_accuracy(sn_ce )
<define_search_space><EOS> 
Y_pred_test = sn_ce.predict(X_scaled_test)
 Y_pred_binarised_test =(Y_pred_test >= 0.5 ).astype("int" ).ravel()
submission = {}
submission['ImageId'] = ID_test
submission['Class'] = Y_pred_binarised_test
submission = pd.DataFrame(submission)
 submission = submission[['ImageId', 'Class']]
submission = submission.sort_values(['ImageId'])
 submission.to_csv("submisision.csv", index=False )