Refactor dataset and backtesting logic in qlib_test.py

Refactor QlibTestDataset and QlibBacktest classes for improved structure and readability. Update inference logic and main execution flow.

finetune/qlib_test.py

@@ -269,6 +269,8 @@ def generate_predictions(config: dict, test_data: dict) -> dict[str, pd.DataFram
                 max_context=config['max_context'], pred_len=config['pred_len'], clip=config['clip'],
                 T=config['T'], top_k=config['top_k'], top_p=config['top_p'], sample_count=config['sample_count']
             )
+            # you can also try this to drop the history data
+            # preds = preds[:, -config['pred_len']:, :]
 
             # The 'close' price is at index 3 in `feature_list`
             last_day_close = x[:, -1, 3].numpy()
@@ -356,3 +358,4 @@ def main():
 
 if __name__ == '__main__':
     main()
+