A sparse vector is a 1D numerical list where most (say, more than 95% of) values will be 0 (or some other default) and for reasons of memory efficiency you don't wish to store these. (cf. Sparse array ...
Simply speaking, dvf (dual vector foil) is a recursive pretty printer for any objects in Python. It allows you to inspect Python object in a simple and comprehensive way. Checkout the following ...
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