Some fixes for training notebook.

notebooks/piper_multilingual_training_notebook.ipynb

@@ -364,6 +364,8 @@
         "#@markdown # <font color=\"pink\"> **5. Run the TensorBoard extension.** 📈\n",
         "\n",
         "#@markdown The TensorBoard is used to visualize the results of the model while it is being trained.\n",
+        "\n",
+        "#@markdown **Note: due to piper update, the tensorboard is not working at the moment.**\n",
         "%load_ext tensorboard\n",
         "%tensorboard --logdir {output_dir}"
       ],
@@ -389,7 +391,6 @@
         "    --num-test-examples 2 \\\n",
         "    --quality {quality} \\\n",
         "    --checkpoint-epochs {checkpoint_epochs} \\\n",
-        "    --check_val_every_n_epoch {checkpoint_epochs} \\\n",
         "    --log_every_n_steps {log_every_n_steps} \\\n",
         "    --max_epochs {max_epochs} \\\n",
         "    {ft_command}\\\n",