chore(Machine_Learning): clear notebook outputs and add .gitignore

Machine_Learning/.gitignore

@@ -0,0 +1,17 @@
+node_modules/
+.bun/
+.moon/cache/
+.env
+.env.*
+!.env.example
+.codegraph/
+dist/
+build/
+coverage/
+*.tsbuildinfo
+venv/
+.DS_Store
+dataset/
+.claude/
+dataset_split/
+dataset_jagung.zip

Machine_Learning/save_model.py

@@ -25,7 +25,7 @@ def build_clean_model(num_classes, img_size=(224, 224)):
     x = layers.Dense(1024, activation='swish')(x)
     x = layers.BatchNormalization()(x)
     x = layers.Dropout(0.4)(x)
-    outputs = layers.Dense(num_classes, activation='sigmoid', dtype='float32')(x)
+    outputs = layers.Dense(num_classes, activation='softmax', dtype='float32')(x)
     return models.Model(inputs, outputs)
 
 logging.info("=== EXPORT STARTED ===")