add more rl task in examples

examples/gymnax/pendulum.py

@@ -0,0 +1,39 @@
+import jax.numpy as jnp
+
+from config import *
+from pipeline_jitable_env import Pipeline
+from algorithm import NEAT
+from algorithm.neat.gene import NormalGene, NormalGeneConfig
+from problem.rl_env import GymNaxConfig, GymNaxEnv
+
+
+def example_conf():
+    return Config(
+        basic=BasicConfig(
+            seed=42,
+            fitness_target=0,
+            pop_size=10000
+        ),
+        neat=NeatConfig(
+            inputs=3,
+            outputs=1,
+        ),
+        gene=NormalGeneConfig(
+            activation_default=Act.tanh,
+            activation_options=(Act.tanh,),
+        ),
+        problem=GymNaxConfig(
+            env_name='Pendulum-v1',
+            output_transform=lambda out: out * 2  # the action of pendulum is [-2, 2]
+        )
+    )
+
+
+if __name__ == '__main__':
+    conf = example_conf()
+
+    algorithm = NEAT(conf, NormalGene)
+    pipeline = Pipeline(conf, algorithm, GymNaxEnv)
+    state = pipeline.setup()
+    pipeline.pre_compile(state)
+    state, best = pipeline.auto_run(state)