show the real waveform on TB too for GAN vocoder training.

TTS/bin/train_vocoder_gan.py

@@ -443,8 +443,9 @@ def evaluate(model_G, criterion_G, model_D, criterion_D, ap, global_step, epoch)
         tb_logger.tb_eval_figures(global_step, figures)
 
         # Sample audio
-        sample_voice = y_hat[0].squeeze(0).detach().cpu().numpy()
-        tb_logger.tb_eval_audios(global_step, {"eval/audio": sample_voice}, c.audio["sample_rate"])
+        predict_waveform = y_hat[0].squeeze(0).detach().cpu().numpy()
+        real_waveform = y_G[0].squeeze(0).cpu().numpy()
+        tb_logger.tb_eval_audios(global_step, {"eval/audio": predict_waveform, "eval/real_waveformo": real_waveform}, c.audio["sample_rate"])
 
         tb_logger.tb_eval_stats(global_step, keep_avg.avg_values)