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add QTensorCI contructor which takes a tensor train #19

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add QTensorCI contructor which takes a tensor train #19

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68d6af9
add QTensorCI contructor which takes a tensor train
Jan 6, 2025
672e75d
add test for constructing QTensorCI from a tensor train
Jan 14, 2025
2810ce3
add test for quantics for complex valued function
yurielnf Jan 16, 2025
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17 changes: 15 additions & 2 deletions include/xfac/tensor/tensor_ci_2.h
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Original file line number Diff line number Diff line change
Expand Up @@ -79,8 +79,8 @@ struct TensorCI2 {
{}

/// constructs a TensorCI2 from a given tensor train, and using the provided function f.
TensorCI2(function<T(vector<int>)> f_, TensorTrain<T> tt_, TensorCI2Param param_={})
: f {f_, param_.useCachedFunction}
TensorCI2(TensorFunction<T> const& f_, TensorTrain<T> tt_, TensorCI2Param param_={})
: f {f_}
, param(param_)
, pivotError(1)
, Iset {tt_.M.size()}
Expand Down Expand Up @@ -124,6 +124,11 @@ struct TensorCI2 {
iterate(1,0); // just to define tt, while reevaluating the original f in the pivots.
}

/// constructs a TensorCI2 from a given tensor train, and using the provided function f.
TensorCI2(function<T(vector<int>)> f_, TensorTrain<T> tt_, TensorCI2Param param_={})
: TensorCI2(TensorFunction<T> {f_, param_.useCachedFunction}, tt_, param_)
{}

/// constructs a TensorCI2 from a given tensor train. It takes the tt as a true function f.
TensorCI2(TensorTrain<T> const& tt_, TensorCI2Param param_={}) : TensorCI2(tt_, tt_, param_) {}

Expand Down Expand Up @@ -387,6 +392,8 @@ class QTensorCI: public TensorCI2<T> {
public:
grid::Quantics grid;

QTensorCI() = default;

/// constructs a rank-1 QTensorCI from a function f:(u1,u2,...,un)->T and the given quantics grid
QTensorCI(function<T(vector<double>)> f_, grid::Quantics grid_, TensorCI2Param par={})
: TensorCI2<T> {tensorFun(f_,grid_), grid_.tensorDims(), par}
Expand All @@ -399,6 +406,12 @@ class QTensorCI: public TensorCI2<T> {
, grid {grid_}
{}

/// constructs a rank-1 QTensorCI from a function f:(u1,u2,...,un)->T, a tensor train and the given quantics grid
QTensorCI(function<T(vector<double>)> f_, grid::Quantics grid_, TensorTrain<T> tt_, TensorCI2Param par={})
: TensorCI2<T> {tensorFun(f_,grid_), tt_, par}
, grid {grid_}
{}

/// returns the underline quantics tensor train
QTensorTrain<T> get_qtt() const { return {this->tt, grid}; }

Expand Down