[Unity][Training] Enhance gradient system #15230
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This PR adds these features to the gradient system:
- Checkpointing for gradient pass
- `tvm.relax.testing.nn.checkpoint`
- `tvm.relax.op.grad.start_checkpoint` and `tvm.relax.op.grad.start_checkpoint`
- Support in the Gradient pass
- Fix several minor problems in op_gradient
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This PR adds these features to the gradient system:
tvm.relax.testing.nn.checkpointtvm.relax.op.grad.start_checkpointandtvm.relax.op.grad.start_checkpointThe logics for registering tir gradients still need be considered and refactored for several design considerations.