first commit

third_party/bhtsne/README.md

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+implement of t-SNE algorithm, reduce high dims of feature to 2D/3D used for display on screen later.
+
+header-only style please refer to https://github.com/lvdmaaten/bhtsne
+
+
+```
+compile test:
+g++ tsne_test.cpp -o bh_tsne_test -O2
+
+and run:
+./bh_tsne_test
+
+```