Update README.md

tz28 · Sep 29, 2018 · 134281f · 134281f
1 parent 0000a3b
commit 134281f
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -40,8 +40,8 @@ def relu_backward(dA, cache):
 	dZ -- Gradient of the cost with respect to Z
 	"""
 	Z = cache
-	A = np.maximum(0, Z)
-	dZ = dA * np.int64(A > 0) # np.int64(A > 0)是A对Z求导
+	#A = np.maximum(0, Z),这一步我认为根据relu的导数是没有必要的，不过有了对结果也没有影响
+	dZ = dA * np.int64(Z > 0)
 	return dZ
 ```
 **ng在作业中写的relu导数（个人认为是错的）为：<br>**