add drop_base_params helper func

neurodsp/sim/params.py

@@ -11,6 +11,8 @@
 ###################################################################################################
 ###################################################################################################
 
+BASE_PARAMS = ['n_seconds', 'fs']
+
 class SimParams():
     """Object for managing simulation parameters.
 
@@ -613,3 +615,22 @@ def clear(self, clear_samplers=True, clear_params=False, clear_base=False):
 
         if clear_params:
             super().clear(clear_base=clear_base)
+
+
+## Utilities for helping with parameter management
+
+def drop_base_params(params):
+    """Drop base parameters from a parameter definition.
+
+    Parameters
+    ----------
+    params : dict
+        Parameter definition.
+
+    Returns
+    -------
+    params : dict
+        Parameter definition, exluding base parameters.
+    """
+
+    return {key : value for key, value in params.items() if key not in BASE_PARAMS}

neurodsp/tests/sim/test_params.py

@@ -160,3 +160,11 @@ def test_sim_samplers_upd(tsim_samplers):
 
     tsim_samplers.update_sampler('samp_exp', 'n_samples', 100)
     assert tsim_samplers['samp_exp'].n_samples == 100
+
+def test_drop_base_params():
+
+    params = {'n_seconds' : 2, 'fs' : 250, 'exponent' : -1}
+    out1 = drop_base_params(params)
+    for bparam in BASE_PARAMS:
+        assert bparam not in out1
+    assert 'exponent' in params