多项选择题
In the following assertions for descent direction, which ones are correct ? （ ）
A.
The descent direction is unique when the cost function is strictly convex.
B.
For a unconstrained optimization problem, an descent direction is also a feasible direction.
C.
If the angle between a vector and the gradient direction is greater than 90º，then this vector is a descent direction.
D.
The value of the cost function will decrease along a descent direction.
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