diff --git a/tools/validate.py b/tools/validate.py
index be499c1a3bed51ea2e0631d71dd3d3630ad97bff..3c85fb553f4329931a8178adafeb94d49ebbb4ac 100644
--- a/tools/validate.py
+++ b/tools/validate.py
@@ -18,8 +18,6 @@ import os
 import os.path
 import numpy as np
 import re
-from scipy import spatial
-from scipy import stats
 
 import common
 
@@ -60,14 +58,22 @@ def calculate_sqnr(expected, actual):
     return signal_power_sum / (noise_power_sum + 1e-15)
 
 
+def calculate_similarity(u, v, data_type=np.float64):
+    if u.dtype is not data_type:
+        u = u.astype(data_type)
+    if v.dtype is not data_type:
+        v = v.astype(data_type)
+    return np.dot(u, v) / (np.linalg.norm(u) * np.linalg.norm(v))
+
+
 def compare_output(platform, device_type, output_name, mace_out_value,
                    out_value, validation_threshold):
     if mace_out_value.size != 0:
         out_value = out_value.reshape(-1)
         mace_out_value = mace_out_value.reshape(-1)
         assert len(out_value) == len(mace_out_value)
-        similarity = (1 - spatial.distance.cosine(out_value, mace_out_value))
         sqnr = calculate_sqnr(out_value, mace_out_value)
+        similarity = calculate_similarity(out_value, mace_out_value)
         common.MaceLogger.summary(
             output_name + ' MACE VS ' + platform.upper()
             + ' similarity: ' + str(similarity) + ' , sqnr: ' + str(sqnr))