multi-hot, or tf-idf encoded representations
    *   `CategoryCrossing`: create new categorical features representing
        co-occurrences of previous categorical feature values
    *   `Hashing`: the hashing trick, for large-vocabulary categorical features
    *   `Discretization`: turn continuous numerical features into categorical
        features by binning their values

Guava is a set of core Java libraries from Google that includes new collection
types (such as multimap and multiset), immutable collections, a graph library,
and utilities for concurrency, I/O, hashing, primitives, strings, and more! It
is widely used on most Java projects within Google, and widely used by many
other companies as well.



Guava comes in two flavors:

* 🌐 Add Chinese translation for Tutorial - Debugging. PR [#2737](https://github.com/tiangolo/fastapi/pull/2737) by [@blt232018](https://github.com/blt232018).
* 🌐 Add Chinese translation for Tutorial - Security - OAuth2 with Password (and hashing), Bearer with JWT tokens. PR [#2642](https://github.com/tiangolo/fastapi/pull/2642) by [@waynerv](https://github.com/waynerv).