Error in pybind for continuous tensor trains

[MattJean]

Hi,

I got the python error

tci_ttd.get_CTensorTrain(0).core[0](0.1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: unhandled return_value_policy

I suggest istead something like

           .def("eval_core", [](const CTensorTraind& tt, size_t i, double x) {
                    return tt.M[i](x);
                }, "i"_a, "x"_a)

for both CTensorCI1 and 2

See you,

Matt ;)

[yurielnf]

Hello!
Agree. Can you make a pull request with the proposal?