Are you sure you have a checkpoint
file in this directory ? Can you verify its content ?
$ ls -al eng/deepspeech-0.6.0-checkpoint/checkpoint
lrwxrwxrwx 1 alex alex 19 déc. 6 10:41 eng/deepspeech-0.6.0-checkpoint/checkpoint -> best_dev_checkpoint
$ cat eng/deepspeech-0.6.0-checkpoint/checkpoint
model_checkpoint_path: "best_dev-233784"
all_model_checkpoint_paths: "best_dev-233784"
You might need to symlink like that.