changelog update

CHANGELOG.md

@@ -10,12 +10,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - During training, model checkpoints will be saved at the end of each training epoch in addition to the checkpoints saved at the end of every validation run.
 - Besides as a local file, model weights can be specified from a URL. Upon initial download, the weights file is cached for future re-use.
+- Training and optimizer metrics can now be logged to a CSV file by setting the `log_metrics` config file option to true - the CSV file will be written to under a sub-directory of the output directory named `csv_logs`.
 
 ### Changed
 
 - Removed the `evaluate` sub-command, and all model evaluation functionality has been moved to the `sequence` command using the new `--evaluate` flag.
 - The `--output` option has been split into two options, `--output_dir` and `--output_root`.
 - The `--validation_peak_path` is now optional when training; if `--validation_peak_path` is not set then the `train_peak_path` will also be used for validation.
+- The `tb_summarywriter` config option is now a boolean config option, and if set to true the TensorBoard summary will be written to a sub-directory of the output directory named `tensorboard`.
 
 ### Fixed