fv_variations_from_vector

t3toolbox.backend.fv_operations.fv_variations_from_vector(flat, variation_shapes, stack_shape=())

def fv_variations_from_vector(
        flat:               NDArray,            # shape=(size,)
        variation_shapes:   VariationShapes,
        stack_shape:        typ.Sequence[int] = (),
) -> Variations:

Rebuild variation cores from a 1D vector (inverse of flattening the variation cores).

Each core is reshaped to stack_shape + core_shape, consuming the flat vector in order (tucker-variation cores first, then tt-variation cores).

Parameters:

• flat (NDArray)

• variation_shapes (VariationShapes)

• stack_shape (t3toolbox.backend.common.typ.Sequence[int])

Return type:

Variations