Exponential LR Schedule

Compute the learning rate after t steps under exponential decay: ${\eta }_t={\eta }_0{\gamma }^t\backslash eta\_t=\backslash eta\_0\backslash ,\backslash gamma^\{t\}$, where lr0 is the initial rate and gamma the per-step decay factor.

Implement solve(lr0,gamma,t).

Returns. Return the learning rate as a float.

Examples

Example 1

Input:

solve(0.1, 0.9, 5)

Output:

0.059049

Example 2

Input:

solve(1.0, 0.5, 3)

Output:

0.125