review(Jetstream Pt): avoid double iteration on slots

text-generation-inference/server/text_generation_server/jetstream_pt_support/generator.py

@@ -483,8 +483,7 @@ def _select_from_slots(self, logits: jnp.ndarray, batch_size: int=0) -> jnp.ndar
         pad_token_id = self.tokenizer.pad_token_id
         batch_size = logits.shape[0]
         tokens = jnp.full((batch_size, 1), pad_token_id)
-        active_slots = [slot for slot in self.slots if slot.state == slot.State.READY]
-        for slot in active_slots:
+        for slot in filter(lambda slot: slot.state == slot.State.READY, self.slots):
             # Every slot might have a different selection criteria, so we are obliged to call select in a loop
             next_token = slot.select(logits)
             tokens = tokens.at[slot.id].set(next_token)