quantize reset clock before training

Summary: During retraining for quantization the clock is not reset.

Reviewed By: EdouardGrave

Differential Revision: D5014862

fbshipit-source-id: effb619efdb55196971b7e18db89fcb344919d8e

src/fasttext.cc

@@ -232,6 +232,7 @@ void FastText::quantize(std::shared_ptr<Args> qargs) {
       args_->lr = qargs->lr;
       args_->thread = qargs->thread;
       args_->verbose = qargs->verbose;
+      start = clock();
       tokenCount = 0;
       std::vector<std::thread> threads;
       for (int32_t i = 0; i < args_->thread; i++) {