diff --git a/hal-classifier/requirements.txt b/hal-classifier/requirements.txt
index c2d846a..5a40abb 100644
--- a/hal-classifier/requirements.txt
+++ b/hal-classifier/requirements.txt
@@ -1,4 +1,6 @@
 more-itertools
-numpy
-scipy
+numpy==1.19.1
+scipy==1.5.4
 fasttext
+faiss-cpu==1.7.2
+
diff --git a/hal-classifier/v1/en/dist_kn3_HAL_en_v1.py b/hal-classifier/v1/en/dist_kn3_HAL_en_v1.py
index 3d859d0..bf3d4d1 100644
--- a/hal-classifier/v1/en/dist_kn3_HAL_en_v1.py
+++ b/hal-classifier/v1/en/dist_kn3_HAL_en_v1.py
@@ -9,7 +9,8 @@
 
 
 
-from scipy.spatial import cKDTree as KDTree
+#from scipy.spatial import cKDTree as KDTree
+import faiss
 from scipy.special import softmax
 import numpy as np
 import sys
@@ -22,15 +23,15 @@
 import fasttext
 
 
+model=fasttext.load_model("modelhal0EN2.bin")
+D=np.load("HALen_matrixKDT.npy")
 
-
-model=fasttext.load_model("./v1/en/modelhal0EN2.bin")
-D=np.load("./v1/en/HALen_matrixKDT.npy")
-
-dico_nd_pkl=open("./v1/en/dico_nd.pkl","rb")    
+dico_nd_pkl=open("dico_nd.pkl","rb")    
 dico_nd=pickle.load(dico_nd_pkl)
 
-
+d=200
+quantizer = faiss.IndexFlatL2(d)
+quantizer.add(D)
 
 verb_class={"spi":"Sciences de l'ingénieur [physics]","shs":"Sciences de l'Homme et Société","sdv":"Sciences du Vivant [q-bio]","sdu":"Planète et Univers [physics]","sde":"Sciences de l'environnement","scco":"Sciences cognitives","phys":"Physique [physics]","nlin":"Science non linéaire [physics]","math":"Mathématiques [math]","info":"Informatique [cs]","chim":"Chimie","stat":"Statistiques","qfin":"Économie et finance quantitative [q-fin]"}
 
@@ -48,9 +49,15 @@
     text=data['value']
 
     mv=model.get_sentence_vector(text.strip())
+    t=np.asmatrix(mv)
 
-    ppv=kdtree.query(mv,k=K,p=2)#,distance_upper_bound=0.05)
-    dmax_k=kdtree.query(mv,k=[K],p=2)[0][0]
+    Dis, Ind = quantizer.search(t,K)
+    ppv=Dis[0],Ind[0] #ppv=Dis et Ind
+
+    #ppv=kdtree.query(mv,k=K,p=2)#,distance_upper_bound=0.05)
+    #dmax_k=kdtree.query(mv,k=[K],p=2)[0][0]
+
+    dmax_k=Dis[0][K-1]
     dN_ppv=ppv[0]/dmax_k
     distlist.append(ppv[0][0]/dmax_k)