Title: ADELT: Unsupervised Transpilation Between Deep Learning Frameworks. Abstract: We propose Adversarial DEep Learning Transpiler (ADELT) for source-to-source transpilation between deep learning frameworks. Unlike prior approaches, ADELT formulates the transpilation problem as mapping API keyword (an API function name or a parameter name). Based on contextual embeddings extracted by a BERT for code, we train aligned API embeddings in a domain-adversarial setting, upon which we generate a dictionary for keyword translation. The model is trained on our unlabeled DL corpus from web crawl data, without using any hand-crafted rules and parallel data. Our method outperforms state-of-the-art transpilers on multiple transpilation pairs including PyTorch-Keras and PyTorch-MXNet. We make our code, corpus, and evaluation benchmark publicly available.