More informative PPL readout line (#914)

Nexesenex · web-flow · commit 6a805c73b4f3 · 2025-11-07T16:41:24.000+02:00
* More informative PPL readout line

* trailing whitespace..
diff --git a/examples/perplexity/perplexity.cpp b/examples/perplexity/perplexity.cpp
@@ -682,7 +682,7 @@ static results_perplexity perplexity(llama_context * ctx, const gpt_params & par
     nll2 -= nll * nll;
     if (nll2 > 0) {
         nll2 = sqrt(nll2/(count-1));
-        printf("Final estimate: PPL = %.4lf +/- %.5lf\n", ppl, nll2*ppl);
+        printf("Final estimate: PPL over %d chunks for n_ctx=%d = %.4lf +/- %.5lf\n", n_chunk, n_ctx, ppl, nll2*ppl);
     } else {
         printf("Unexpected negative standard deviation of log(prob)\n");
     }

Original file line number	Diff line number	Diff line change
`@@ -682,7 +682,7 @@ static results_perplexity perplexity(llama_context * ctx, const gpt_params & par`
`682`	`682`	`nll2 -= nll * nll;`
`683`	`683`	`if (nll2 > 0) {`
`684`	`684`	`nll2 = sqrt(nll2/(count-1));`
`685`		`- printf("Final estimate: PPL = %.4lf +/- %.5lf\n", ppl, nll2*ppl);`
	`685`	`+ printf("Final estimate: PPL over %d chunks for n_ctx=%d = %.4lf +/- %.5lf\n", n_chunk, n_ctx, ppl, nll2*ppl);`
`686`	`686`	`} else {`
`687`	`687`	`printf("Unexpected negative standard deviation of log(prob)\n");`
`688`	`688`	`}`