diff --git a/onnxruntime/python/tools/quantization/qdq_loss_debug.py b/onnxruntime/python/tools/quantization/qdq_loss_debug.py
index 6e9fc612b1..4983811c21 100644
--- a/onnxruntime/python/tools/quantization/qdq_loss_debug.py
+++ b/onnxruntime/python/tools/quantization/qdq_loss_debug.py
@@ -343,9 +343,11 @@ def compute_signal_to_quantization_noice_ratio(
     left = numpy.concatenate(xlist).flatten()
     right = numpy.concatenate(ylist).flatten()
 
-    Ps = numpy.linalg.norm(left)
-    Pn = numpy.linalg.norm(left - right) + numpy.finfo("float").eps
-    return 20 * math.log10(Ps / Pn)
+    epsilon = numpy.finfo("float").eps
+    tensor_norm = max(numpy.linalg.norm(left), epsilon)
+    diff_norm = max(numpy.linalg.norm(left - right), epsilon)
+    res = tensor_norm / diff_norm
+    return 20 * math.log10(res)
 
 
 def compute_weight_error(