Labeling sequences (any kind of sequences), using Python. E.g. using python-crfsuite, sklearn-crfsuite, PyStruct, pytorch-crf, and others. Not as trendy as "deep learning", but: - quite reliable, used in leading linguistic packages, - can give good results on limited training data (provided you can specify features, which requires domain knowledge), - but computationally intensive.
Colab Notebook: https://bit.ly/crf-wordseg https://bit.ly/crf-wordseg-slides