Fix compilation error on Colab T4 GPU.

Author: NTT123

vietTTS/nat/config.py

@@ -15,7 +15,8 @@ class FLAGS(Namespace):
     acoustic_encoder_dim = 256
 
     # dataset
-    max_phoneme_seq_len = 128 * 3
+    max_phoneme_seq_len = 256 * 1
+    assert max_phoneme_seq_len % 256 == 0  # prevent compilation error on Colab T4 GPU
     max_wave_len = 1024 * 64 * 3
 
     # Montreal Forced Aligner