Update app.py

app.py

@@ -122,7 +122,13 @@ with gr.Blocks() as demo:
     train_btn = gr.Button("Train")
     progress = gr.Textbox(label="Progress", interactive=False)
     results_plot = gr.Image(label="Token Length Distribution")
-    download_button = gr.File(label="Download Tokenizer", value=TOKENIZER_FILE)
+#    download_button = gr.File(label="Download Tokenizer", value=TOKENIZER_FILE)
+    # Έλεγχος αν υπάρχει ήδη ο tokenizer
+    if os.path.exists(TOKENIZER_FILE):
+        initial_file_value = TOKENIZER_FILE
+    else:
+        initial_file_value = None  # Αν δεν υπάρχει, ξεκινάει ως None
+    download_button = gr.File(label="Download Tokenizer", value=initial_file_value)
 
     train_btn.click(train_and_test, [dataset_name, configs, split, vocab_size, min_freq, test_text], [progress, test_text, results_plot])