Memory leak in current master

[mikegerber]

[mikegerber]

It does not seem to go above 24G, but it's enough to make the system swap go brrrr

[mikegerber]

a. TF1-Keras' model.predict() seems to be leaking
b. The main issue seems to be connected to "too many workers"

[mikegerber]

The problem - after some fixing regarding TF, for example update to TF2 - seems to be the multiprocessing pool leaking memory.