[Target] Use TargetNode::attrs for Target serialization #5993
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This PR contains several minor but breaking changes as mentioned in #5960.
TargetNode::attrs
for serialization, which means that the raw string exported from target object may largely differ from the raw string input to create target object.-mattr
toArray<String>
fromString
.keys
fromattrs
after parsing, in order to avoid potential duplication and confusion. De-duplicatekeys
after parsing.-target
is migrated to-mtriple
to avoid potential confusion.Future work:
-device
should be deprecated.-model
is used in autotvm, should migrate totag
as per TVM Target Specification.