Merge pull request #12241 from KratosMultiphysics/RomApp_hrom_util_me…

…mory

[RomApp] Memory improvement in hrom_training_utility.py

applications/RomApplication/python_scripts/hrom_training_utility.py

@@ -288,26 +288,17 @@ def __GetHRomTrainingDefaultSettings(cls):
         return default_settings
 
     def __CalculateResidualBasis(self):
-        # Set up the residual snapshots matrix
-        residuals_snapshot_matrix = self._GetResidualsProjectedMatrix()
-
-        # Calculate the randomized and truncated SVD of the residual snapshots
+        # Calculate the randomized and truncated SVD of the residual snapshots #TODO add other SVD options
         u,_,_,_ = RandomizedSingularValueDecomposition(COMPUTE_V=False).Calculate(
-            residuals_snapshot_matrix,
+            self._GetResidualsProjectedMatrix(),
             self.element_selection_svd_truncation_tolerance)
 
         return u
 
 
 
     def _GetResidualsProjectedMatrix(self):
-        # Set up the residual snapshots matrix
-        n_steps = len(self.time_step_residual_matrix_container)
-        residuals_snapshot_matrix = self.time_step_residual_matrix_container[0]
-        for i in range(1,n_steps):
-            del self.time_step_residual_matrix_container[0] # Avoid having two matrices, numpy does not concatenate references.
-            residuals_snapshot_matrix = np.c_[residuals_snapshot_matrix,self.time_step_residual_matrix_container[0]]
-        return residuals_snapshot_matrix
+        return np.block(self.time_step_residual_matrix_container)