When installing PocketSphinx it will often fail (using PIP) as the latest wheels provided are for Python 3.6 and to build the source code you need SWIG and GIT (and you need them on your PATH). So ...

Python interface to CMU SphinxBase and PocketSphinx libraries created with SWIG. Pocketsphinx packages include python support, however, it is not well supported on OpenWrt. This package provides ...