Rewrite pow and logical functional apis

[hjchen2]

No description provided.

[github-actions]

CI failed, removing label automerge

[github-actions]

CI failed, removing label automerge

[github-actions]

CI failed, removing label automerge

[github-actions]

Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 140.2ms (= 7011.2ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 127.9ms (= 6393.3ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.10 (= 140.2ms / 127.9ms)

PyTorch resnet50 time: 83.3ms (= 4163.5ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 74.4ms (= 3717.9ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.12 (= 83.3ms / 74.4ms)

PyTorch resnet50 time: 57.7ms (= 2882.9ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 47.2ms (= 2360.1ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.22 (= 57.7ms / 47.2ms)

PyTorch resnet50 time: 48.9ms (= 2443.7ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 39.1ms (= 1956.6ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 1.25 (= 48.9ms / 39.1ms)

PyTorch resnet50 time: 44.7ms (= 2235.0ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 43.2ms (= 2159.9ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 1.03 (= 44.7ms / 43.2ms)