Faster SimulationResult loading: use slices (#491)

pysb/simulator/base.py

@@ -1267,10 +1267,10 @@ def load(cls, filename, dataset_name=None, group_name=None):
             obs_and_exprs = None
 
             if 'observables' in dset.keys():
-                obs_and_exprs = list(dset['observables'])
+                obs_and_exprs = list(dset['observables'][:])
 
             if 'expressions' in dset.keys():
-                exprs = dset['expressions']
+                exprs = dset['expressions'][:]
                 if obs_and_exprs is None:
                     obs_and_exprs = list(exprs)
                 else:
@@ -1282,12 +1282,12 @@ def load(cls, filename, dataset_name=None, group_name=None):
 
             trajectories = None
             try:
-                trajectories = dset['trajectories']
+                trajectories = dset['trajectories'][:]
             except KeyError:
                 pass
 
             try:
-                initials = np.array(dset['initials'])
+                initials = dset['initials'][:]
             except KeyError:
                 initials = pickle.loads(dset['initials_dict'][()])
 
@@ -1304,8 +1304,8 @@ def load(cls, filename, dataset_name=None, group_name=None):
                 simulator=None,
                 model=model,
                 initials=initials,
-                param_values=np.array(dset['param_values']),
-                tout=np.array(dset['tout']),
+                param_values=dset['param_values'][:],
+                tout=dset['tout'][:],
                 trajectories=trajectories,
                 observables_and_expressions=obs_and_exprs,
                 squeeze=dset.attrs['squeeze'],