Comparing the performance of Weka and python :
1.Python is much easier to play around with, try out ideas, etc.
WEKA is very verbose. It might be more robust but it's not a
language to easily try stuff out. It's an enterprise-y language,
which can be sort of a cludge if you want to write some quick
data-mangling script or glue together some ML algorithms.
2.Python has a very healthy ML ecosystem. There are a lot of
libraries out there, much of the research is done in those
languages, and you have very good tooling for data-exploration.
They have interactive sessions (REPL).
3."The speed benefit" isn't actually that large. While current
python implementations are rather slow, they allow to easily
interface with plain C code. Often, the ML libraries people use are
written in plain C under the hood, and are optimized for speed.
1.The first thing that can be said is that WEKA does not need a
programming knowledge. WEKA is for people that are using ML for
quick runs without needing to understand it.
2.It uses tons of memory and inefficient implementations.
3.You are restricted by what WEKA offers you. If you want to glue
algorithms together / tune them / try out your own ideas in ways
that the restrictive WEKA framework doesn't allow, you have to dig
around WEKA's source code and work with Java, which is wordy and
just not flexible enough.
So if you are a statistician (with no knowledge of programming languages) then you can use WEKA by its graphic interface. This is an advantage that makes it very useful for this category of users.
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