Add Pywrap sources

src/PyClassifiers/PyClassifier.cc

@@ -0,0 +1,100 @@
+#include "PyClassifier.h"
+namespace pywrap {
+    namespace bp = boost::python;
+    namespace np = boost::python::numpy;
+    PyClassifier::PyClassifier(const std::string& module, const std::string& className) : module(module), className(className), fitted(false)
+    {
+        // This id allows to have more than one instance of the same module/class
+        id = reinterpret_cast<clfId_t>(this);
+        pyWrap = PyWrap::GetInstance();
+        pyWrap->importClass(id, module, className);
+    }
+    PyClassifier::~PyClassifier()
+    {
+        pyWrap->clean(id);
+    }
+    np::ndarray tensor2numpy(torch::Tensor& X)
+    {
+        int m = X.size(0);
+        int n = X.size(1);
+        auto Xn = np::from_data(X.data_ptr(), np::dtype::get_builtin<float>(), bp::make_tuple(m, n), bp::make_tuple(sizeof(X.dtype()) * 2 * n, sizeof(X.dtype()) * 2), bp::object());
+        Xn = Xn.transpose();
+        return Xn;
+    }
+    std::pair<np::ndarray, np::ndarray> tensors2numpy(torch::Tensor& X, torch::Tensor& y)
+    {
+        int n = X.size(1);
+        auto yn = np::from_data(y.data_ptr(), np::dtype::get_builtin<int32_t>(), bp::make_tuple(n), bp::make_tuple(sizeof(y.dtype()) * 2), bp::object());
+        return { tensor2numpy(X), yn };
+    }
+    std::string PyClassifier::version()
+    {
+        return pyWrap->version(id);
+    }
+    std::string PyClassifier::sklearnVersion()
+    {
+        return pyWrap->sklearnVersion();
+    }
+    std::string PyClassifier::callMethodString(const std::string& method)
+    {
+        return pyWrap->callMethodString(id, method);
+    }
+    PyClassifier& PyClassifier::fit(torch::Tensor& X, torch::Tensor& y)
+    {
+        if (!fitted && hyperparameters.size() > 0) {
+            pyWrap->setHyperparameters(id, hyperparameters);
+        }
+        auto [Xn, yn] = tensors2numpy(X, y);
+        CPyObject Xp = bp::incref(bp::object(Xn).ptr());
+        CPyObject yp = bp::incref(bp::object(yn).ptr());
+        pyWrap->fit(id, Xp, yp);
+        fitted = true;
+        return *this;
+    }
+    PyClassifier& PyClassifier::fit(torch::Tensor& X, torch::Tensor& y, const std::vector<std::string>& features, const std::string& className, std::map<std::string, std::vector<int>>& states)
+    {
+        return fit(X, y);
+    }
+    torch::Tensor PyClassifier::predict(torch::Tensor& X)
+    {
+        int dimension = X.size(1);
+        auto Xn = tensor2numpy(X);
+        CPyObject Xp = bp::incref(bp::object(Xn).ptr());
+        PyObject* incoming = pyWrap->predict(id, Xp);
+        bp::handle<> handle(incoming);
+        bp::object object(handle);
+        np::ndarray prediction = np::from_object(object);
+        if (PyErr_Occurred()) {
+            PyErr_Print();
+            throw std::runtime_error("Error creating object for predict in " + module + " and class " + className);
+        }
+        int* data = reinterpret_cast<int*>(prediction.get_data());
+        std::vector<int> vPrediction(data, data + prediction.shape(0));
+        auto resultTensor = torch::tensor(vPrediction, torch::kInt32);
+        Py_XDECREF(incoming);
+        return resultTensor;
+    }
+    double PyClassifier::score(torch::Tensor& X, torch::Tensor& y)
+    {
+        auto [Xn, yn] = tensors2numpy(X, y);
+        CPyObject Xp = bp::incref(bp::object(Xn).ptr());
+        CPyObject yp = bp::incref(bp::object(yn).ptr());
+        auto result = pyWrap->score(id, Xp, yp);
+        return result;
+    }
+    void PyClassifier::setHyperparameters(const nlohmann::json& hyperparameters)
+    {
+        // Check if hyperparameters are valid, default is no hyperparameters
+        const std::vector<std::string> validKeys = { };
+        checkHyperparameters(validKeys, hyperparameters);
+        this->hyperparameters = hyperparameters;
+    }
+    void PyClassifier::checkHyperparameters(const std::vector<std::string>& validKeys, const nlohmann::json& hyperparameters)
+    {
+        for (const auto& item : hyperparameters.items()) {
+            if (find(validKeys.begin(), validKeys.end(), item.key()) == validKeys.end()) {
+                throw std::invalid_argument("Hyperparameter " + item.key() + " is not valid");
+            }
+        }
+    }
+} /* namespace pywrap */