Fix deprecated call to jnp.clip (#664)

Author: GaetanLepage

blackjax/mcmc/proposal.py

@@ -153,7 +153,7 @@ def progressive_biased_sampling(
     biases the transition away from the trajectory's initial state.
 
     """
-    p_accept = jnp.clip(jnp.exp(new_proposal.weight - proposal.weight), a_max=1)
+    p_accept = jnp.clip(jnp.exp(new_proposal.weight - proposal.weight), max=1)
     do_accept = jax.random.bernoulli(rng_key, p_accept)
     new_weight = jnp.logaddexp(proposal.weight, new_proposal.weight)
     new_sum_log_p_accept = jnp.logaddexp(
@@ -224,7 +224,7 @@ def static_binomial_sampling(
     then the new proposal is accepted with probability 1.
 
     """
-    p_accept = jnp.clip(jnp.exp(log_p_accept), a_max=1)
+    p_accept = jnp.clip(jnp.exp(log_p_accept), max=1)
     do_accept = jax.random.bernoulli(rng_key, p_accept)
     info = do_accept, p_accept, None
     return (
@@ -253,7 +253,7 @@ def nonreversible_slice_sampling(
     to the accept/reject step of a current state and new proposal.
 
     """
-    p_accept = jnp.clip(jnp.exp(delta_energy), a_max=1)
+    p_accept = jnp.clip(jnp.exp(delta_energy), max=1)
     do_accept = jnp.log(jnp.abs(slice)) <= delta_energy
     slice_next = slice * (jnp.exp(-delta_energy) * do_accept + (1 - do_accept))
     info = do_accept, p_accept, slice_next