Update README.md #37

	name: Build from source
	on: [push]
	jobs:
	Build-from-source:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Build
	run: \|
	bash build.sh

	- name: Test
	run: \|
	### We need to run export again if we move to the different step ###
	export PATH="$HOME/miniconda/bin:$PATH"
	export PYTHONPATH=$HOME/faiss/build/faiss/python/build/lib:$PYTHONPATH

	cd $HOME/faiss

	echo "##### Check ldd of .so #####"
	ldd build/faiss/libfaiss_avx2.so

	echo "##### Run c++ test #####"
	make -C build -j demo_ivfpq_indexing
	./build/demos/demo_ivfpq_indexing

	echo "##### Run python test #####"
	cd
	python -c "import faiss, numpy; err = faiss.Kmeans(10, 20).train(numpy.random.rand(1000, 10).astype('float32')); print(err)"

	echo "##### Check AVX2 is working or not #####"
	LD_DEBUG=libs python -c "import faiss" 2>&1 \| grep libfaiss_avx2.so

	echo "import faiss
	import numpy as np
	import time

	np.random.seed(234)
	D = 128
	N = 10000
	X = np.random.random((N, D)).astype(np.float32)
	M = 64
	nbits = 4

	pq = faiss.IndexPQ(D, M, nbits)
	pq.train(X)
	pq.add(X)

	pq_fast = faiss.IndexPQFastScan(D, M, nbits)
	pq_fast.train(X)
	pq_fast.add(X)

	t0 = time.time()
	d1, ids1 = pq.search(x=X[:3], k=5)
	t1 = time.time()
	print(f'pq: {(t1 - t0) * 1000} msec')

	t0 = time.time()
	d2, ids2 = pq_fast.search(x=X[:3], k=5)
	t1 = time.time()
	print(f'pq_fast: {(t1 - t0) * 1000} msec')

	assert np.allclose(ids1, ids2)
	" > check.py
	python check.py

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