Small canges in ACE example.

examples/ACE-aHfO2/fit-ace-aHfO2.jl

@@ -25,14 +25,14 @@ ds = load_data(ds_path, uparse("eV"), uparse("Å"))
 
 # Split atomistic dataset into training and test
 n_train, n_test = 50, 50 # only 50 samples per dataset are used in this example.
-conf_train, conf_test = split(ds, n_train, n_test)
+conf_train, conf_test = split(ds[1:1000], n_train, n_test)
 
 # ## Create ACE basis, compute descriptors and add them to the dataset.
 
 # Create ACE basis
 basis = ACE(species           = [:Hf, :O],
             body_order        = 3,
-            polynomial_degree = 3,
+            polynomial_degree = 4,
             rcutoff           = 5.0,
             wL                = 1.0,
             csp               = 1.0,