Update: generate efanna graph

ADD:deep1b efanna graph

Rename efanna_graph/glove_50k_50.graph to efanna_graph/glove_50k_50nn.graph

Update build_efanna_graph.sh

ADD: efanna graph index

ADD: sift1m.npy

ADD: multi format data and process code, missing sift1m npy format

ADD: format data code

ADD: glove and deep1b

INIT:anns

initial commit