Refactor: Removed joblib from simulate_dipole, and added parallel exe…

…cution test.

Signed-off-by: samadpls <[email protected]>

examples/howto/plot_batch_simulate.py

@@ -24,7 +24,7 @@
 from hnn_core import jones_2009_model
 
 # The number of cores may need modifying depending on your current machine.
-n_jobs = 10
+n_jobs = 4
 ###############################################################################
 # The `add_evoked_drive` function simulates external input to the network,
 # mimicking sensory stimulation or other external events.
@@ -116,7 +116,8 @@ def summary_func(results):
 net = jones_2009_model(mesh_shape=(3, 3))
 batch_simulation = BatchSimulate(net=net,
                                  set_params=set_params,
-                                 summary_func=summary_func)
+                                 summary_func=summary_func,
+                                 n_trials=10)
 simulation_results = batch_simulation.run(param_grid,
                                           n_jobs=n_jobs,
                                           combinations=False,

hnn_core/batch_simulate.py

@@ -9,7 +9,6 @@
 import os
 from joblib import Parallel, delayed, parallel_config
 
-from .parallel_backends import JoblibBackend
 from .network import Network
 from .externals.mne import _validate_type, _check_option
 from .dipole import simulate_dipole
@@ -294,15 +293,14 @@ def _run_single_sim(self, param_values, n_jobs=1):
         results = {'net': net, 'param_values': param_values}
 
         if self.save_dpl:
-            with JoblibBackend(n_jobs=n_jobs):
-                dpl = simulate_dipole(net,
-                                      tstop=self.tstop,
-                                      dt=self.dt,
-                                      n_trials=self.n_trials,
-                                      record_vsec=self.record_vsec,
-                                      record_isec=self.record_isec,
-                                      postproc=self.postproc)
-                results['dpl'] = dpl
+            dpl = simulate_dipole(net,
+                                  tstop=self.tstop,
+                                  dt=self.dt,
+                                  n_trials=self.n_trials,
+                                  record_vsec=self.record_vsec,
+                                  record_isec=self.record_isec,
+                                  postproc=self.postproc)
+            results['dpl'] = dpl
 
         if self.save_spiking:
             results['spiking'] = {

hnn_core/tests/test_batch_simulate.py

@@ -4,6 +4,7 @@
 #          Mainak Jas <[email protected]>
 
 from pathlib import Path
+import time
 import pytest
 import numpy as np
 import os
@@ -290,3 +291,27 @@ def test_load_results(batch_simulate_instance, param_grid, tmp_path):
     # Validation Tests
     with pytest.raises(TypeError, match='results must be'):
         batch_simulate_instance._save("invalid_results", start_idx, end_idx)
+
+
+def test_parallel_execution(batch_simulate_instance, param_grid):
+    """Test parallel execution of simulations and ensure speedup."""
+
+    param_combinations = batch_simulate_instance._generate_param_combinations(
+        param_grid)
+
+    start_time = time.perf_counter()
+    results_serial = batch_simulate_instance.simulate_batch(
+        param_combinations, n_jobs=1, backend='loky')
+    end_time = time.perf_counter()
+    serial_time = end_time - start_time
+
+    start_time = time.perf_counter()
+    results_parallel = batch_simulate_instance.simulate_batch(
+        param_combinations,
+        n_jobs=4,
+        backend='loky')
+    end_time = time.perf_counter()
+    parallel_time = end_time - start_time
+
+    assert (serial_time > parallel_time
+            ), "Parallel execution is not faster than serial execution!"