CPU Support Minor Bug

[tedmoskovitz]

Hello, I believe I found a minor bug in IntentAccuracyDailyDialog, lines 672-3 in envs/text_generation/metric.py. The device is currently set with the following two lines:

self._device = "cuda" if torch.cuda.is_available() else "cpu"
self._device = f"cuda:{torch.cuda.device_count() - 1}"

However, I believe it should be such that the device is f"cuda:{torch.cuda.device_count() - 1}" if on GPU and "cpu" otherwise (as currently it can never be set to CPU, and instead tries to find "cuda:-1"). Thanks so much for putting this library together!