Optimize use of Unsqueeze to add a single dimension to a tensor
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- Use `TensorBase::insert_axis` to more efficiently insert new axes into the output - Add fast path when `axes` vector has only one item, in which case we can skip testing the axes for uniqueness
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Optimize this common use of
Unsqueeze:Use
TensorBase::insert_axisto more efficiently insert new axes into the outputAdd fast path when
axesvector has only one item, in which case we can skip testing the axes for uniqueness