step 176: val_der=0.345218

step 169: val_der=0.362314

step 140: val_der=0.374601

step 133: val_der=0.435824

step 104: val_der=0.464523

step 61: val_der=0.470385

step 50: val_der=0.501383

step 43: val_der=0.555531

step 32: val_der=0.717348

step 25: val_der=0.862043

step 14: val_der=1.516024

step 7: val_der=2.089066