Add gradient related API

cyprecice/SolverInterface.pxd

@@ -101,6 +101,18 @@ cdef extern from "precice/SolverInterface.hpp" namespace "precice":
 
         void readScalarData (const int dataID, const int valueIndex, double& value) const
 
+        # Gradient related API 
+
+        bool isGradientDataRequired(int dataID) const;
+
+        void writeBlockVectorGradientData(int dataID, int size, const int* valueIndices, const double* gradientValues);
+
+        void writeScalarGradientData(int dataID, int valueIndex, const double* gradientValues);
+
+        void writeVectorGradientData(int dataID, int valueIndex, const double* gradientValues);
+
+        void writeBlockScalarGradientData(int dataID, int size, const int* valueIndices, const double* gradientValues);
+
         # direct mesh access
 
         void setMeshAccessRegion (const int meshID, const double* boundingBox) const

cyprecice/cyprecice.pyx

@@ -1211,6 +1211,244 @@ cdef class Interface:
         self.thisptr.readScalarData (data_id, vertex_id, _value)
         return _value
 
+    def write_block_vector_gradient_data (self, data_id, vertex_ids, gradientValues):
+        """
+        Writes vector gradient data given as block. This function writes values of specified vertices to a dataID.
+        Values are provided as a block of continuous memory. Values are stored in a numpy array [N x D] where N = number
+        of vertices and D = number of gradient components.
+
+        Parameters
+        ----------
+        data_id : int
+            Data ID to write to.
+        vertex_ids : array_like
+            Indices of the vertices.
+        gradientValues : array_like
+             Gradient values differentiated in the spacial direction (dx, dy) for 2D space, (dx, dy, dz) for 3D space
+
+        Notes
+        -----
+        Previous calls:
+            Count of available elements at values matches the configured dimension
+            Count of available elements at vertex_ids matches the given size
+            Initialize() has been called
+            Data with dataID has attribute hasGradient = true
+
+        Examples
+        --------
+        Write block gradient vector data for a 2D problem with 2 vertices:
+        >>> data_id = 1
+        >>> vertex_ids = [1, 2]
+        >>> gradientValues = np.array([[v1x_dx, v1y_dx,v1x_dy, v1y_dy], [v2x_dx, v2y_dx,v2x_dy, v2y_dy]])
+        >>> interface.write_block_vector_data(data_id, vertex_ids, gradientValues)
+
+        Write block vector data for a 3D (D=3) problem with 2 (N=2) vertices:
+        >>> data_id = 1
+        >>> vertex_ids = [1, 2]
+        >>> gradientValues = np.array([[v1x_dx, v1y_dx, v1z_dx, v1x_dy, v1y_dy, v1z_dy, v1x_dz, v1y_dz, v1z_dz], [v2x_dx, v2y_dx, v2z_dx, v2x_dy, v2y_dy, v2z_dy, v2x_dz, v2y_dz, v2z_dz]])
+        >>> interface.write_block_vector_data(data_id, vertex_ids, gradientValues)
+        """
+        check_array_like(vertex_ids, "vertex_ids", "write_block_vector_gradient_data")
+        check_array_like(gradientValues, "gradientValues", "write_block_vector_gradient_data")
+
+        if not isinstance(gradientValues, np.ndarray):
+            gradientValues = np.asarray(gradientValues)
+
+        if len(gradientValues) > 0:
+            size, dimensions = gradientValues.shape
+            assert dimensions == self.get_dimensions() * self.get_dimensions(), "Dimensions of vector data in write_block_vector_gradient_data does not match with dimensions in problem definition. Provided dimensions: {}, expected dimensions: {}".format(dimensions, self.get_dimensions() *  self.get_dimensions())
+        if len(gradientValues) == 0:
+            size = 0
+
+        cdef np.ndarray[int, ndim=1] _vertex_ids = np.ascontiguousarray(vertex_ids, dtype=np.int32)
+        cdef np.ndarray[double, ndim=1] _gradientValues = np.ascontiguousarray(gradientValues.flatten(), dtype=np.double)
+
+        assert _gradientValues.size == size * self.get_dimensions() * self.get_dimensions(), "Vector data is not provided for all vertices in write_block_vector_data. Check length of input data provided. Provided size: {}, expected size: {}".format(_gradientValues.size, size * self.get_dimensions() * self.get_dimensions())
+        assert _vertex_ids.size == size, "Vertex IDs are of incorrect length in write_block_vector_gradient_data. Check length of vertex ids input. Provided size: {}, expected size: {}".format(_vertex_ids.size, size)
+
+        self.thisptr.writeBlockVectorGradientData (data_id, size, <const int*>_vertex_ids.data, <const double*>_gradientValues.data)
+
+    def write_scalar_gradient_data (self, data_id, vertex_id, gradientValues):
+        """
+        Writes scalar gradient data to a vertex
+        This function writes the corresponding gradient matrix value of a specified vertex to a dataID.
+
+        The gradients need to be provided in the following format:
+
+        The 2D-format of gradientValues is (v_dx, v_dy) vector corresponding to the data block v = (v)
+        differentiated respectively in x-direction dx and y-direction dy
+
+        The 3D-format of gradientValues is (v_dx, v_dy, v_dz) vector
+        corresponding to the data block v = (v) differentiated respectively in spatial directions x-direction dx and y-direction dy and z-direction dz
+
+        Parameters
+        ----------
+        data_id : int
+            ID to write to.
+        vertex_id : int
+            Index of the vertex.
+        gradientValue : array_like
+            A vector of the gradient values.
+
+        Notes
+        -----
+        Count of available elements at value matches the configured dimension
+        Vertex with dataID exists and contains data
+        Data with dataID has attribute hasGradient = true
+
+        Previous calls:
+            initialize() has been called
+
+        Examples
+        --------
+        Write scalar data for a 2D problem with 5 vertices:
+        >>> data_id = 1
+        >>> vertex_id = 5
+        >>> gradientValue = [v5_dx,v5_dy]
+        >>> interface.write_scalar_gradient_data(data_id, vertex_id, gradientValue)
+        """
+
+        check_array_like(gradientValues, "gradientValues", "write_scalar_gradient_data")
+
+        if not isinstance(gradientValues, np.ndarray):
+            gradientValues = np.asarray(gradientValues)
+
+        cdef np.ndarray[double, ndim=1] _gradientValues = np.ascontiguousarray(gradientValues.flatten(), dtype=np.double)
+
+        assert _gradientValues.size == self.get_dimensions(), "Vector data provided for vertex {} in write_scalar_gradient_data does not match problem definition. Check length of input data provided. Provided size: {}, expected size: {}".format(_gradientValues.size, self.get_dimensions())
+
+        self.thisptr.writeScalarGradientData(data_id, vertex_id, <const double*>_gradientValues.data)
+
+    def write_vector_gradient_data (self, data_id, vertex_id, gradientValues):
+        """
+        Writes vector gradient data to a vertex
+        This function writes the corresponding gradient matrix value of a specified vertex to a dataID.
+
+        The gradients need to be provided in the following format:
+
+        The 2D-format of \p gradientValues is (vx_dx, vy_dx, vx_dy, vy_dy) vector corresponding to the data block v = (vx, vy)
+        differentiated respectively in x-direction dx and y-direction dy
+
+        The 3D-format of \p gradientValues is (vx_dx, vy_dx, vz_dx, vx_dy, vy_dy, vz_dy, vx_dz, vy_dz, vz_dz) vector
+        corresponding to the data block v = (vx, vy, vz) differentiated respectively in spatial directions x-direction dx and y-direction dy and z-direction dz
+
+        Parameters
+        ----------
+        data_id : int
+            ID to write to.
+        vertex_id : int
+            Index of the vertex.
+        gradientValue : array_like
+            A vector of the gradient values.
+
+        Notes
+        -----
+        Count of available elements at value matches the configured dimension
+        Vertex with dataID exists and contains data
+        Data with dataID has attribute hasGradient = true
+
+        Previous calls:
+            initialize() has been called
+
+        Examples
+        --------
+        Write scalar data for a 2D problem with 5 vertices:
+        >>> data_id = 1
+        >>> vertex_id = 5
+        >>> gradientValue = [v5x_dx, v5y_dx, v5x_dy,v5y_dy]
+        >>> interface.write_vector_gradient_data(data_id, vertex_id, gradientValue)
+        """
+
+        check_array_like(gradientValues, "gradientValues", "write_vector_gradient_data")
+
+        if not isinstance(gradientValues, np.ndarray):
+            gradientValues = np.asarray(gradientValues)
+
+        cdef np.ndarray[double, ndim=1] _gradientValues = np.ascontiguousarray(gradientValues.flatten(), dtype=np.double)
+
+        assert _gradientValues.size == self.get_dimensions()* self.get_dimensions(), "Vector data provided for vertex {} in write_scalar_gradient_data does not match problem definition. Check length of input data provided. Provided size: {}, expected size: {}".format(_gradientValues.size, self.get_dimensions() * self.get_dimensions())
+
+        self.thisptr.writeVectorGradientData(data_id, vertex_id, <const double*>_gradientValues.data)
+
+    def write_block_scalar_gradient_data (self, data_id, vertex_ids, gradientValues):
+        """
+        Writes scalar gradient data given as block. This function writes values of specified vertices to a dataID.
+        Values are provided as a block of continuous memory. Values are stored in a numpy array [N x D] where N = number
+        of vertices and D = dimensions of geometry.
+
+        Parameters
+        ----------
+        data_id : int
+            Data ID to write to.
+        vertex_ids : array_like
+            Indices of the vertices.
+        gradientValues : array_like
+             Gradient values differentiated in the spacial direction (dx, dy) for 2D space, (dx, dy, dz) for 3D space
+
+        Notes
+        -----
+        Previous calls:
+            Count of available elements at values matches the configured dimension
+            Count of available elements at vertex_ids matches the given size
+            Initialize() has been called
+            Data with dataID has attribute hasGradient = true
+
+        Examples
+        --------
+        Write block gradient vector data for a 2D problem with 2 vertices:
+        >>> data_id = 1
+        >>> vertex_ids = [1, 2]
+        >>> gradientValues = np.array([[v1_dx, v1_dy],[v2_dx, v2_dy]])
+        >>> interface.write_block_vector_data(data_id, vertex_ids, gradientValues)
+
+        Write block vector data for a 3D (D=3) problem with 2 (N=2) vertices:
+        >>> data_id = 1
+        >>> vertex_ids = [1, 2]
+        >>> values = np.array([[v1_dx, v1_dy, v1x_dz], [v2_dx. v2_dy, v2_dz]])
+        >>> interface.write_block_scalar_data(data_id, vertex_ids, values)
+        """
+        check_array_like(vertex_ids, "vertex_ids", "write_block_scalar_gradient_data")
+        check_array_like(gradientValues, "gradientValues", "write_block_sclar_gradient_data")
+
+        if not isinstance(gradientValues, np.ndarray):
+            gradientValues = np.asarray(gradientValues)
+
+        if len(gradientValues) > 0:
+            size, dimensions = gradientValues.shape
+            assert dimensions == self.get_dimensions() , "Dimensions of vector data in write_block_scalar_gradient_data does not match with dimensions in problem definition. Provided dimensions: {}, expected dimensions: {}".format(dimensions, self.get_dimensions())
+        if len(gradientValues) == 0:
+            size = 0
+
+        cdef np.ndarray[int, ndim=1] _vertex_ids = np.ascontiguousarray(vertex_ids, dtype=np.int32)
+        cdef np.ndarray[double, ndim=1] _gradientValues = np.ascontiguousarray(gradientValues.flatten(), dtype=np.double)
+
+        assert _gradientValues.size == size * self.get_dimensions(), "Vector data is not provided for all vertices in write_block_vector_data. Check length of input data provided. Provided size: {}, expected size: {}".format(_gradientValues.size, size * self.get_dimensions())
+        assert _vertex_ids.size == size, "Vertex IDs are of incorrect length in write_block_scalar_gradient_data. Check length of vertex ids input. Provided size: {}, expected size: {}".format(_vertex_ids.size, size)
+
+        self.thisptr.writeBlockScalarGradientData (data_id, size, <const int*>_vertex_ids.data, <const double*>_gradientValues.data)
+
+    def is_gradient_data_required(self,data_id):
+        """
+        Checks if the given data set requires gradient data. We check if the data object has been intialized with the gradient flag.
+        Parameters
+        ----------
+        data_id : int
+            Data ID to check.
+
+        Returns
+        -------
+        bool
+            True if gradient data is required for a dataID.
+
+        Examples
+        --------
+        Check if gradient data is required for a dataID:
+        >>> data_id = 1
+        >>> interface.is_gradient_data_required(data_id)
+        """
+        return self.thisptr.isGradientDataRequired(data_id)
+
+
     def set_mesh_access_region (self, mesh_id, bounding_box):
         """
         This function is required if you don't want to use the mapping schemes in preCICE, but rather 

test/SolverInterface.cpp

@@ -4,6 +4,7 @@
 #include <cassert>
 
 std::vector<double> fake_read_write_buffer;
+std::vector<double> fake_gradient_buffer;
 int fake_dimensions;
 int fake_mesh_id;
 std::vector<int> fake_ids;
@@ -395,6 +396,56 @@ void SolverInterface:: getMeshVerticesAndIDs
     }
 }
 
+bool SolverInterface::isGradientDataRequired(int dataID) const
+{
+  return 0;
+}
+
+void SolverInterface::writeBlockVectorGradientData(
+    int           dataID,
+    int           size,
+    const int    *valueIndices,
+    const double *gradientValues)
+{
+  fake_gradient_buffer.clear();
+  for (int i = 0; i < size * this->getDimensions() * this->getDimensions(); i++) {
+    fake_gradient_buffer.push_back(gradientValues[i]);
+  }
+}
+
+void SolverInterface::writeScalarGradientData(
+    int           dataID,
+    int           valueIndex,
+    const double *gradientValues)
+{
+  fake_gradient_buffer.clear();
+  for (int i = 0; i < this->getDimensions(); i++) {
+    fake_gradient_buffer.push_back(gradientValues[i]);
+  }
+}
+void SolverInterface::writeBlockScalarGradientData(
+    int           dataID,
+    int           size,
+    const int    *valueIndices,
+    const double *gradientValues)
+{
+  fake_gradient_buffer.clear();
+  for (int i = 0; i < size * this->getDimensions(); i++) {
+    fake_gradient_buffer.push_back(gradientValues[i]);
+  }
+}
+
+void SolverInterface::writeVectorGradientData(
+    int           dataID,
+    int           valueIndex,
+    const double *gradientValues)
+{
+  fake_gradient_buffer.clear();
+  for (int i = 0; i < this->getDimensions() * this->getDimensions(); i++) {
+    fake_gradient_buffer.push_back(gradientValues[i]);
+  }
+}
+
 std::string getVersionInformation()
 {
     std::string dummy ("dummy");