(update: works for me now)
cfg_kwargs.update(cfg_updates)
cfg = PegasusConfig(**cfg_updates) -> cfg = PegasusConfig(**cfg_kwargs)  
Also, even got an error with model name in tokenizer which i later changed from “sshleifer/pegasus” to “google/pegasus-aeslc”
command: python convert_pegasus_tf_to_pytorch.py gs://pegasus_ckpt/arxiv/model.ckpt-32000 save_dir
Thanks !