fixed "cannot allocate memory" exception by specifying max_processes #910
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When using the regular retriever.train method (as specified in Tutorial 9), the process fails in my local setting, due to an "cannot allocate memory error".
After looking through the code, it turns out that the max_processes is by default 128 in farm's DataSilo. When I decreased it to a lower value, the method worked as expected.
Thus, I inserted the option to inject the max_processes value directly through the train method.