fix wrong mock of torchvision

[farmerzhang1]

只mock torch及其子模块，修复 https://github.com/Oneflow-Inc/OneCloud/issues/183#issuecomment-1325968704

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CI failed when running job: Build cpu. PR label automerge has been removed

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Speed stats:

GPU Name: GeForce GTX 1080 









❌ OneFlow resnet50 time: 142.1ms (= 14208.6ms / 100, input_shape=[16, 3, 224, 224], ddp, world size=2)
PyTorch resnet50 time: 165.0ms (= 16498.3ms / 100, input_shape=[16, 3, 224, 224], ddp, world size=2)
✔️ Relative speed: 1.16 (= 165.0ms / 142.1ms)

OneFlow resnet50 time: 86.5ms (= 8652.4ms / 100, input_shape=[8, 3, 224, 224], ddp, world size=2)
PyTorch resnet50 time: 103.4ms (= 10342.0ms / 100, input_shape=[8, 3, 224, 224], ddp, world size=2)
✔️ Relative speed: 1.20 (= 103.4ms / 86.5ms)

OneFlow resnet50 time: 58.1ms (= 11613.5ms / 200, input_shape=[4, 3, 224, 224], ddp, world size=2)
PyTorch resnet50 time: 88.5ms (= 17695.0ms / 200, input_shape=[4, 3, 224, 224], ddp, world size=2)
✔️ Relative speed: 1.52 (= 88.5ms / 58.1ms)

OneFlow resnet50 time: 44.4ms (= 8876.7ms / 200, input_shape=[2, 3, 224, 224], ddp, world size=2)
PyTorch resnet50 time: 71.0ms (= 14209.5ms / 200, input_shape=[2, 3, 224, 224], ddp, world size=2)
✔️ Relative speed: 1.60 (= 71.0ms / 44.4ms)

OneFlow resnet50 time: 41.4ms (= 8274.8ms / 200, input_shape=[1, 3, 224, 224], ddp, world size=2)
PyTorch resnet50 time: 67.8ms (= 13561.6ms / 200, input_shape=[1, 3, 224, 224], ddp, world size=2)
✔️ Relative speed: 1.64 (= 67.8ms / 41.4ms)

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View latest API docs preview at: https://staging.oneflow.info/docs/Oneflow-Inc/oneflow/pr/9473/