Dev advanced indexing

[hjchen2]

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[github-actions]

CI failed, removing label automerge

[github-actions]

Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 138.5ms (= 6925.8ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 124.1ms (= 6206.4ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.12 (= 138.5ms / 124.1ms)

PyTorch resnet50 time: 82.6ms (= 4127.5ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 72.7ms (= 3634.5ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.14 (= 82.6ms / 72.7ms)

PyTorch resnet50 time: 57.9ms (= 2894.0ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 55.8ms (= 2792.5ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.04 (= 57.9ms / 55.8ms)

PyTorch resnet50 time: 48.5ms (= 2427.1ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 55.8ms (= 2788.4ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 0.87 (= 48.5ms / 55.8ms)

PyTorch resnet50 time: 42.7ms (= 2137.0ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 45.4ms (= 2270.4ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 0.94 (= 42.7ms / 45.4ms)