Refactor TensorTrain constructors to remove ITensorMPS dependency #8
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- Remove ITensorMPS dependency from TensorTrain constructors
- Delegate to general constructor for TensorTrain(Type, sites) and TensorTrain(Type, sites, linkdims)
- Always use MPO decomposition for TensorTrain(ITensor, sites) and TensorTrain(AbstractArray, sites)
- Add type constraints: sites must be AbstractVector{<:Index} or AbstractVector{<:AbstractVector{<:Index}}
- Simplify contract() to always convert inputs to MPO format
- Add MPO-like check in product() for first argument
- Update docstrings to remove internal implementation details (MPO references)
- Update alg parameter type constraint to Union{String, Algorithm}
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This PR refactors TensorTrain constructors to:
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