test for interpolation with simulated normal energy distribution

python/src/bind_ClusterFile.hpp

@@ -44,14 +44,14 @@ void define_ClusterFile(py::module &m, const std::string &typestr) {
                  auto v = new ClusterVector<ClusterType>(self.read_frame());
                  return v;
              })
-        .def("set_roi", &ClusterFile<ClusterType>::set_roi,
-             py::arg("roi"))
+        .def("set_roi", &ClusterFile<ClusterType>::set_roi, py::arg("roi"))
         .def(
             "set_noise_map",
             [](ClusterFile<ClusterType> &self, py::array_t<int32_t> noise_map) {
                 auto view = make_view_2d(noise_map);
                 self.set_noise_map(view);
-            }, py::arg("noise_map"))
+            },
+            py::arg("noise_map"))
 
         .def("set_gain_map",
              [](ClusterFile<ClusterType> &self, py::array_t<double> gain_map) {
@@ -84,11 +84,19 @@ template <typename Type, uint8_t CoordSizeX, uint8_t CoordSizeY,
           typename CoordType = uint16_t>
 void register_calculate_eta(py::module &m) {
     using ClusterType = Cluster<Type, CoordSizeX, CoordSizeY, CoordType>;
+
     m.def("calculate_eta2",
           [](const aare::ClusterVector<ClusterType> &clusters) {
               auto eta2 = new NDArray<double, 2>(calculate_eta2(clusters));
               return return_image_data(eta2);
           });
+
+    m.def("calculate_eta2", [](const aare::Cluster<Type, CoordSizeX, CoordSizeY,
+                                                   CoordType> &cluster) {
+        auto eta2 = calculate_eta2(cluster);
+        // TODO return proper eta class
+        return py::make_tuple(eta2.x, eta2.y, eta2.sum);
+    });
 }
 
 #pragma GCC diagnostic pop

python/src/module.cpp

@@ -87,6 +87,8 @@ PYBIND11_MODULE(_aare, m) {
     DEFINE_CLUSTER_BINDINGS(double, 9, 9, uint16_t, d);
     DEFINE_CLUSTER_BINDINGS(float, 9, 9, uint16_t, f);
 
+    // DEFINE_CLUSTER_BINDINGS(double, 2, 1, uint16_t, d);
+
     define_3x3_reduction<int, 3, 3, uint16_t>(m);
     define_3x3_reduction<double, 3, 3, uint16_t>(m);
     define_3x3_reduction<float, 3, 3, uint16_t>(m);

python/tests/test_Cluster.py

@@ -53,8 +53,8 @@ def test_Interpolator():
 
     assert interpolated_photons.size == 1
 
-    assert interpolated_photons[0]["x"] == -1 
-    assert interpolated_photons[0]["y"] == -1
+    assert interpolated_photons[0]["x"] == 0 
+    assert interpolated_photons[0]["y"] == 0
     assert interpolated_photons[0]["energy"] == 4 #eta_sum = 4, dx, dy = -1,-1 m_ietax = 0, m_ietay = 0
 
     clustervector = _aare.ClusterVector_Cluster2x2i()
@@ -84,7 +84,7 @@ def test_calculate_eta():
     assert eta2[0,0] == 0.5
     assert eta2[0,1] == 0.5
     assert eta2[1,0] == 0.5
-    assert eta2[1,1] == 0.6 #1/5
+    assert eta2[1,1] == 0.4 #2/5
 
 def test_cluster_finder(): 
     """Test ClusterFinder""" 

python/tests/test_Interpolation.py

@@ -0,0 +1,143 @@
+import pytest
+import numpy as np 
+import boost_histogram as bh 
+import pickle
+from scipy.stats import multivariate_normal
+
+from aare import Interpolator, calculate_eta2
+from aare._aare import ClusterVector_Cluster2x2d, Cluster2x2d, Cluster3x3d, ClusterVector_Cluster3x3d
+
+from conftest import test_data_path
+
+pixel_width = 1e-4
+values = np.arange(0.5*pixel_width, 0.1, pixel_width)
+num_pixels = values.size
+X, Y = np.meshgrid(values, values)
+data_points = np.stack([X.ravel(), Y.ravel()], axis=1)
+variance = 10*pixel_width
+covariance_matrix = np.array([[variance, 0],[0, variance]])
+
+def create_photon_hit_with_gaussian_distribution(mean, covariance_matrix, data_points):
+    gaussian = multivariate_normal(mean=mean, cov=covariance_matrix)
+    probability_values = gaussian.pdf(data_points)
+    return (probability_values.reshape(X.shape)).round() #python bindings only support frame types of uint16_t
+
+def photon_hit_in_euclidean_space(cluster_center, pixels_per_superpixel, photon_hit): 
+    scaled_photon_hit_x = cluster_center - (1 - photon_hit[0][0])*0.5*pixels_per_superpixel*pixel_width 
+    scaled_photon_hit_y = cluster_center - (1 - photon_hit[0][1])*0.5*pixels_per_superpixel*pixel_width
+    return (scaled_photon_hit_x, scaled_photon_hit_y)
+
+def create_2x2cluster_from_frame(frame, pixels_per_superpixel):
+    return Cluster2x2d(1, 1, np.array([frame[0:pixels_per_superpixel, 0:pixels_per_superpixel].sum(), 
+                                            frame[0:pixels_per_superpixel, pixels_per_superpixel:2*pixels_per_superpixel].sum(), 
+                                            frame[pixels_per_superpixel:2*pixels_per_superpixel, 0:pixels_per_superpixel].sum(), 
+                                            frame[pixels_per_superpixel:2*pixels_per_superpixel, pixels_per_superpixel:2*pixels_per_superpixel].sum()], dtype=np.float64))
+
+
+def create_3x3cluster_from_frame(frame, pixels_per_superpixel):
+    return Cluster3x3d(1, 1, np.array([frame[0:pixels_per_superpixel, 0:pixels_per_superpixel].sum(), 
+                                    frame[0:pixels_per_superpixel, pixels_per_superpixel:2*pixels_per_superpixel].sum(), 
+                                    frame[0:pixels_per_superpixel, 2*pixels_per_superpixel:3*pixels_per_superpixel].sum(), 
+                                    frame[pixels_per_superpixel:2*pixels_per_superpixel, 0:pixels_per_superpixel].sum(), 
+                                    frame[pixels_per_superpixel:2*pixels_per_superpixel, pixels_per_superpixel:2*pixels_per_superpixel].sum(), 
+                                    frame[pixels_per_superpixel:2*pixels_per_superpixel, 2*pixels_per_superpixel:3*pixels_per_superpixel].sum(), 
+                                    frame[2*pixels_per_superpixel:3*pixels_per_superpixel, 0:pixels_per_superpixel].sum(), 
+                                    frame[2*pixels_per_superpixel:3*pixels_per_superpixel, pixels_per_superpixel:2*pixels_per_superpixel].sum(), 
+                                    frame[2*pixels_per_superpixel:3*pixels_per_superpixel, 2*pixels_per_superpixel:3*pixels_per_superpixel].sum()], dtype=np.float64))
+
+
+def calculate_eta_distribution(num_frames, pixels_per_superpixel, cluster_2x2 = True): 
+    hist = bh.Histogram(
+    bh.axis.Regular(100, -0.2, 1.2), 
+    bh.axis.Regular(100, -0.2, 1.2), bh.axis.Regular(1, 0, num_pixels*num_pixels*1/(variance*2*np.pi))) 
+
+    for frame_index in range(0, num_frames):
+        mean_x = np.random.uniform(pixels_per_superpixel*pixel_width, 2*pixels_per_superpixel*pixel_width)
+        mean_y = np.random.uniform(pixels_per_superpixel*pixel_width, 2*pixels_per_superpixel*pixel_width)
+        frame = create_photon_hit_with_gaussian_distribution(np.array([mean_x, mean_y]), variance, data_points)
+
+        cluster = None
+
+        if cluster_2x2:
+            cluster = create_2x2cluster_from_frame(frame, pixels_per_superpixel)
+        else: 
+            cluster = create_3x3cluster_from_frame(frame, pixels_per_superpixel)
+
+        eta2 = calculate_eta2(cluster)
+        hist.fill(eta2[0], eta2[1], eta2[2])
+
+    return hist
+
+@pytest.mark.withdata
+def test_interpolation_of_2x2_cluster(test_data_path): 
+    """Test Interpolation of 2x2 cluster from Photon hit with Gaussian Distribution""" 
+
+    #TODO maybe better to compute in test instead of loading - depends on eta 
+    """ 
+    filename = test_data_path/"eta_distributions"/"eta_distribution_2x2cluster_gaussian.pkl"
+    with open(filename, "rb") as f:
+        eta_distribution = pickle.load(f)
+    """
+
+    num_frames = 1000
+    pixels_per_superpixel = int(num_pixels*0.5)
+    eta_distribution = calculate_eta_distribution(num_frames, pixels_per_superpixel)
+
+    interpolation = Interpolator(eta_distribution, eta_distribution.axes[0].edges[:-1], eta_distribution.axes[1].edges[:-1], eta_distribution.axes[2].edges[:-1])
+
+    #actual photon hit
+    mean = 1.2*pixels_per_superpixel*pixel_width
+    mean = np.array([mean, mean])
+    frame = create_photon_hit_with_gaussian_distribution(mean, covariance_matrix, data_points)
+    cluster = create_2x2cluster_from_frame(frame, pixels_per_superpixel)
+
+    clustervec = ClusterVector_Cluster2x2d()
+    clustervec.push_back(cluster)
+
+    interpolated_photon = interpolation.interpolate(clustervec)
+
+    assert interpolated_photon.size == 1
+
+    cluster_center = 1.5*pixels_per_superpixel*pixel_width
+
+    scaled_photon_hit = photon_hit_in_euclidean_space(cluster_center, pixels_per_superpixel, interpolated_photon)
+
+    assert (np.linalg.norm(scaled_photon_hit - mean) < np.linalg.norm(np.array([cluster_center, cluster_center] - mean)))
+
+
+@pytest.mark.withdata
+def test_interpolation_of_3x3_cluster(test_data_path): 
+    """Test Interpolation of 3x3 Cluster from Photon hit with Gaussian Distribution""" 
+
+    #TODO maybe better to compute in test instead of loading - depends on eta 
+    """ 
+    filename = test_data_path/"eta_distributions"/"eta_distribution_3x3cluster_gaussian.pkl"
+    with open(filename, "rb") as f:
+        eta_distribution = pickle.load(f)
+    """
+
+    num_frames = 1000
+    pixels_per_superpixel = int(num_pixels/3)
+    eta_distribution = calculate_eta_distribution(num_frames, pixels_per_superpixel, False)
+
+    interpolation = Interpolator(eta_distribution, eta_distribution.axes[0].edges[:-1], eta_distribution.axes[1].edges[:-1], eta_distribution.axes[2].edges[:-1])
+
+    #actual photon hit
+    mean = 1.2*pixels_per_superpixel*pixel_width
+    mean = np.array([mean, mean])
+    frame = create_photon_hit_with_gaussian_distribution(mean, covariance_matrix, data_points)
+    cluster = create_3x3cluster_from_frame(frame, pixels_per_superpixel)
+
+    clustervec = ClusterVector_Cluster3x3d()
+    clustervec.push_back(cluster)
+
+    interpolated_photon = interpolation.interpolate(clustervec)
+
+    assert interpolated_photon.size == 1
+
+    cluster_center = 1.5*pixels_per_superpixel*pixel_width
+
+    scaled_photon_hit = photon_hit_in_euclidean_space(cluster_center, pixels_per_superpixel, interpolated_photon)
+
+    assert (np.linalg.norm(scaled_photon_hit - mean) < np.linalg.norm(np.array([cluster_center, cluster_center] - mean)))
+