fix text of GP example

Author: yallup

advanced/GP.ipynb

@@ -745,7 +745,7 @@
         "\n",
         "This is a good canvas to discuss how to approach the label switching problem. An illustration of this is visible in the corner plot of frequency where 2 identical modes are present. As we are fitting Gaussian basis functions, there is a $N!$ degeneracy in the parameter space. For $N=2$ this is not disasterous, but sampling will quickly become innefficient for higher numbers of basis functions.\n",
         "\n",
-        "There are a few options to address this, forced identifiability is a common transform to map the uniform hypercube over frequency to a simplex space, however this can have unpleasant effects on posterior geometry. In this example we will take a simpler effective approach of simply enforcing a sort in the covariance tuning. To do this we will overwrite the tuning function in the `nss` algorithm to account for this."
+        "There are a few options to address this, forced identifiability is a common transform to map the uniform hypercube over frequency to a simplex space, however this can have unpleasant effects on posterior geometry. In this example we will take a simpler effective approach of imposing a sort in the step function of slice sampling. To do this we will overwrite the stepping function in the `nss` algorithm to account."
       ]
     },
     {
@@ -768,7 +768,7 @@
         }
       ],
       "source": [
-        "def default_stepper(x, n, t):\n",
+        "def wrapped_stepper(x, n, t):\n",
         "    y = jax.tree_map(lambda x, n: x + t * n, x, n)\n",
         "    idx = jnp.argsort(y[\"freq\"])\n",
         "    y[\"freq\"] = jnp.take_along_axis(y[\"freq\"], idx, -1)\n",
@@ -782,7 +782,7 @@
         "    n_delete=n_delete,\n",
         "    num_mcmc_steps=num_mcmc_steps,\n",
         "    ravel_fn=ravel_fn,\n",
-        "    stepper = default_stepper\n",
+        "    stepper = wrapped_stepper\n",
         ")\n",
         "\n",
         "state, final = integrate(nested_sampler,rng_key, sort=True)"