fix: training pipeline bugs

- invalid integer cast
- "resuming" message when not resuming

nnue/.gitignore

@@ -1,2 +1,3 @@
 batches/
 venv/
+train_data/

nnue/process_pgn_data.py

@@ -219,6 +219,7 @@ async def main():
 
         if skipped:
             logging.info("Resuming at file '%s'.", file)
+            skipped = False
         else:
             logging.info("Reading file '%s'.", file)
 

src/eval.rs

@@ -397,7 +397,7 @@ pub fn eval_metrics(board: &Board) -> EvalMetrics {
     let king_distance_eval =
         -advantage * i32::try_from(king_distance).unwrap() * max(7 - phase, 0) / 100;
 
-    let eval = pst_eval + king_distance_eval;
+    let eval = (pst_eval + king_distance_eval).clamp(i16::MIN.into(), i16::MAX.into());
 
     EvalMetrics {
         pst_eval,