[ENH/WIP] New activation function

Author: Leguark

tests/test_gradients/test_gradients_I.py

@@ -32,12 +32,16 @@ def model(sigoid_slope=100, plot=False):
     if plot:
         gpv.plot_2d(geo_model, show_scalar=False, kwargs_lithology={
             "plot_grid": True,
-            "cmap": "viridis"
         })
         plt.show()
     return geo_model
 
 
+def test_this_model():
+    model(-1, plot=True)
+    
+
+
 def test_gradients_numpy():
     geo_model = model(1000, plot=True)