Merge pull request #740 from Jackwaterveg/fix_auto_log

fix the bug: can not use the CPU to test the model

deepspeech/utils/log.py

@@ -157,9 +157,13 @@ class Autolog:
                  model_precision="fp32"):
         import auto_log
         pid = os.getpid()
-        gpu_id = int(os.environ['CUDA_VISIBLE_DEVICES'].split(',')[0])
-        infer_config = inference.Config()
-        infer_config.enable_use_gpu(100, gpu_id)
+        if (os.environ['CUDA_VISIBLE_DEVICES'].strip() != ''):
+            gpu_id = int(os.environ['CUDA_VISIBLE_DEVICES'].split(',')[0])
+            infer_config = inference.Config()
+            infer_config.enable_use_gpu(100, gpu_id)
+        else:
+            gpu_id = None
+            infer_config = inference.Config()
         autolog = auto_log.AutoLogger(
             model_name=model_name,
             model_precision=model_precision,