Updated v2 to use f1 score and dont retrain model

pipeline.py

@@ -2,11 +2,10 @@ import keras_tuner
 import numpy as np
 import pandas as pd
 import shutil
-import os
 
+from keras import Input
 from keras.src.metrics import F1Score
 from pandas import ExcelWriter
-import keras_tuner as kt
 from tensorflow.keras.models import Sequential
 from tensorflow.keras.layers import LSTM, Dense, Dropout, Bidirectional,GRU
 from tensorflow.keras.optimizers import Adam
@@ -14,7 +13,7 @@ from tensorflow.keras.callbacks import ReduceLROnPlateau, EarlyStopping
 from keras_tuner import RandomSearch
 from sklearn.metrics import accuracy_score
 
-epochs = 30
+epochs = 50
 model_type_gru = 'GRU'
 model_type_lstm = 'LSTM'
 model_type_bilstm = 'BiLSTM'
@@ -144,10 +143,10 @@ def train_models(user_data, user_data_val, sequence_lengths, tuner_dir="./workin
 
 # === Training & Validation ===
 def train_models_v2(user_data, user_data_val, sequence_length, model_type):
-    tuner_dir = "./working/tuner"
+    tuner_dir = "./working/tuner/"+model_type
 
-    early_stopping = EarlyStopping(monitor='val_loss', patience=3, restore_best_weights=True)
-    lr_scheduler = ReduceLROnPlateau(monitor='val_loss', factor=0.5, patience=2)
+    early_stopping = EarlyStopping(monitor='val_f1', patience=3, restore_best_weights=True)
+    lr_scheduler = ReduceLROnPlateau(monitor='val_f1', factor=0.5, patience=2)
 
     shutil.rmtree(tuner_dir, ignore_errors=True)
 
@@ -157,41 +156,39 @@ def train_models_v2(user_data, user_data_val, sequence_length, model_type):
     n_features = x.shape[2]
     users = list(user_data.keys())
 
+    y_val = np.array(y_val).reshape(-1, 1)
+    y = np.array(y).reshape(-1, 1)
+
     def build_model(hp):
+        units_hp = hp.Int('units', 2, 256, step=2, sampling="log")
+
         model = Sequential()
+        model.add(Input((sequence_length, n_features)))
         if model_type==model_type_bilstm:
-            model.add(Bidirectional(LSTM(units=hp.Int('units', 32, 256, step=2),
-                                         input_shape=(sequence_length, n_features))))
+            model.add(Bidirectional(LSTM(units=units_hp)))
         if model_type==model_type_lstm:
-            model.add(LSTM(units=hp.Int('units', 32, 256, step=2),
-                                         input_shape=(sequence_length, n_features)))
+            model.add(LSTM(units=units_hp))
         if model_type==model_type_gru:
-            model.add(GRU(units=hp.Int('units', 32, 256, step=2),
-                                         input_shape=(sequence_length, n_features)))
+            model.add(GRU(units=units_hp))
         model.add(Dropout(hp.Float('dropout_rate', 0.1, 0.5, step=0.1)))
         model.add(Dense(len(users), activation='softmax'))
         model.compile(
             optimizer=Adam(learning_rate=hp.Choice('learning_rate', [1e-2, 1e-3, 1e-4])),
             loss='sparse_categorical_crossentropy',
-            metrics=['accuracy']
+            metrics=[F1Score(name='f1', average='weighted')]
         )
         return model
 
     tuner = RandomSearch(
         build_model,
-        objective='val_loss',
-        max_trials=100,
+        objective=keras_tuner.Objective("val_f1", direction="max"),
+        max_trials=120,
         directory=tuner_dir,
     )
 
     tuner.search(x, y, epochs=epochs, validation_data=(x_val, y_val),
                  callbacks=[early_stopping, lr_scheduler])
-
-    best_hps = tuner.get_best_hyperparameters(1)[0]
-    best_model = tuner.hypermodel.build(best_hps)
-    best_model.fit(x, y, epochs=epochs, validation_data=(x_val, y_val),
-                   callbacks=[early_stopping, lr_scheduler])
-    return best_model
+    return tuner.get_best_models(num_models=1)[0]
 
 
 # === Evaluation ===