[minor] print cpu utilization warning

builds on neonbjb#249

Author: p0p4k

tortoise/api.py

@@ -213,7 +213,12 @@ def __init__(self, autoregressive_batch_size=None, models_dir=MODELS_DIR, enable
         self.models_dir = models_dir
         self.autoregressive_batch_size = pick_best_batch_size_for_gpu() if autoregressive_batch_size is None else autoregressive_batch_size
         self.enable_redaction = enable_redaction
-        self.device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
+        if not self.device: 
+            self.device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
+        else:
+            self.device = device
+        if self.device == 'cpu':
+            print("Using cpu, expect extremely long processing time!")
         if self.enable_redaction:
             self.aligner = Wav2VecAlignment()