Switch to using a TryFrom trait rather than From. #683
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This is a second attempt at #605, this replaces the
From
trait converting tensors to scalar values with aTryFrom
trait so that api users can handle the error rather than just getting a panic, as suggested in #602.Because of some limitations in the Rust compiler, it's tricky to have both the
From
andTryFrom
traits available, more details in this rustc issue, so this ends up being a breaking change.