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The derivative of the ReLU function is

AAlways equal to 1 for all real x
BEqual to sigmoid(x) at every point
C1 if x > 0 and 0 if x < 0
DAlways equal to ReLU(x) itself
Answer & Solution
Correct answer: C. 1 if x > 0 and 0 if x < 0
d/dx ReLU(x) is 0 for x < 0 and 1 for x > 0. At x = 0 the derivative is technically undefined in practice the left-hand value of 0 is used.
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