initialize methods

tensorneat/algorithm/neat/__init__.py

@@ -1,5 +1,5 @@
+from .ga import *
 from .gene import *
 from .genome import *
 from .species import *
 from .neat import NEAT
-

tensorneat/algorithm/neat/gene/conn/default.py

@@ -27,6 +27,17 @@ class DefaultConnGene(BaseConnGene):
     def new_custom_attrs(self):
         return jnp.array([self.weight_init_mean])
     
+    def new_random_attrs(self, key):
+        return jnp.array([mutate_float(key,
+                            self.weight_init_mean,
+                            self.weight_init_mean,
+                            1.0,
+                            0,
+                            0,
+                            1.0,
+                            )
+        ])
+
     def mutate(self, key, conn):
         input_index = conn[0]
         output_index = conn[1]

tensorneat/algorithm/neat/gene/node/default.py

@@ -61,6 +61,16 @@ class DefaultNodeGene(BaseNodeGene):
             [self.bias_init_mean, self.response_init_mean, self.activation_default, self.aggregation_default]
         )
     
+    def new_random_attrs(self, key):   
+        return jnp.array([
+            mutate_float(key, self.bias_init_mean, self.bias_init_mean, self.bias_init_std,
+                         self.bias_mutate_power, self.bias_mutate_rate, self.bias_replace_rate),
+            mutate_float(key, self.response_init_mean, self.response_init_mean, self.response_init_std,
+                         self.response_mutate_power, self.response_mutate_rate, self.response_replace_rate),
+            self.activation_default,
+            self.aggregation_default,
+        ])
+
     def mutate(self, key, node):
         k1, k2, k3, k4 = jax.random.split(key, num=4)
         index = node[0]

tensorneat/algorithm/neat/species/default.py

@@ -19,7 +19,8 @@ class DefaultSpecies(BaseSpecies):
                  genome_elitism: int = 2,
                  survival_threshold: float = 0.2,
                  min_species_size: int = 1,
-                 compatibility_threshold: float = 3.
+                 compatibility_threshold: float = 3.,
+                 initialize_method: str = 'one_hidden_node',  # {'one_hidden_node', 'dense_hideen_layer', 'no_hidden_random'}
                  ):
         self.genome = genome
         self.pop_size = pop_size
@@ -34,11 +35,13 @@ class DefaultSpecies(BaseSpecies):
         self.survival_threshold = survival_threshold
         self.min_species_size = min_species_size
         self.compatibility_threshold = compatibility_threshold
+        self.initialize_method = initialize_method
 
         self.species_arange = jnp.arange(self.species_size)
 
     def setup(self, randkey):
-        pop_nodes, pop_conns = initialize_population(self.pop_size, self.genome)
+        k1, k2 = jax.random.split(randkey, 2)
+        pop_nodes, pop_conns = initialize_population(self.pop_size, self.genome,k1, self.initialize_method)
 
         species_keys = jnp.full((self.species_size,), jnp.nan)  # the unique index (primary key) for each species
         best_fitness = jnp.full((self.species_size,), jnp.nan)  # the best fitness of each species
@@ -62,7 +65,7 @@ class DefaultSpecies(BaseSpecies):
         pop_nodes, pop_conns = jax.device_put((pop_nodes, pop_conns))
 
         return State(
-            randkey=randkey,
+            randkey=k2,
             pop_nodes=pop_nodes,
             pop_conns=pop_conns,
             species_keys=species_keys,
@@ -489,31 +492,159 @@ class DefaultSpecies(BaseSpecies):
         return jnp.where(max_cnt == 0, 0, val / max_cnt)
 
 
-def initialize_population(pop_size, genome):
-    o_nodes = np.full((genome.max_nodes, genome.node_gene.length), np.nan)  # original nodes
-    o_conns = np.full((genome.max_conns, genome.conn_gene.length), np.nan)  # original connections
 
+
+def initialize_population(pop_size, genome, randkey, init_method='default'):
+    rand_keys = jax.random.split(randkey, pop_size)
+    
+    if init_method == 'one_hidden_node':
+        init_func = init_one_hidden_node
+    elif init_method == 'dense_hideen_layer':
+        init_func = init_dense_hideen_layer
+    elif init_method == 'no_hidden_random':
+        init_func = init_no_hidden_random
+    else:
+        raise ValueError("Unknown initialization method: {}".format(init_method))
+
+    pop_nodes, pop_conns = jax.vmap(init_func, in_axes=(None, 0))(genome, rand_keys)
+
+    return pop_nodes, pop_conns
+
+# one hidden node
+def init_one_hidden_node(genome, randkey):
     input_idx, output_idx = genome.input_idx, genome.output_idx
     new_node_key = max([*input_idx, *output_idx]) + 1
 
-    o_nodes[input_idx, 0] = genome.input_idx
-    o_nodes[output_idx, 0] = genome.output_idx
-    o_nodes[new_node_key, 0] = new_node_key  # one hidden node
-    o_nodes[np.concatenate([input_idx, output_idx]), 1:] = genome.node_gene.new_custom_attrs()
-    o_nodes[new_node_key, 1:] = genome.node_gene.new_custom_attrs()  # one hidden node
+    nodes = jnp.full((genome.max_nodes, genome.node_gene.length), jnp.nan)
+    conns = jnp.full((genome.max_conns, genome.conn_gene.length), jnp.nan)
 
-    input_conns = np.c_[input_idx, np.full_like(input_idx, new_node_key)]  # input nodes to hidden
-    o_conns[input_idx, 0:2] = input_conns  # in key, out key
-    o_conns[input_idx, 2] = True  # enabled
-    o_conns[input_idx, 3:] = genome.conn_gene.new_custom_attrs()
+    nodes = nodes.at[input_idx, 0].set(input_idx)
+    nodes = nodes.at[output_idx, 0].set(output_idx)
+    nodes = nodes.at[new_node_key, 0].set(new_node_key) 
 
-    output_conns = np.c_[np.full_like(output_idx, new_node_key), output_idx]  # hidden to output nodes
-    o_conns[output_idx, 0:2] = output_conns  # in key, out key
-    o_conns[output_idx, 2] = True  # enabled
-    o_conns[output_idx, 3:] = genome.conn_gene.new_custom_attrs()
+    rand_keys_nodes = jax.random.split(randkey, num=len(input_idx) + len(output_idx) + 1)
+    input_keys, output_keys, hidden_key = rand_keys_nodes[:len(input_idx)], rand_keys_nodes[len(input_idx):len(input_idx) + len(output_idx)], rand_keys_nodes[-1]
 
-    # repeat origin genome for P times to create population
-    pop_nodes = np.tile(o_nodes, (pop_size, 1, 1))
-    pop_conns = np.tile(o_conns, (pop_size, 1, 1))
+    node_attr_func = jax.vmap(genome.node_gene.new_random_attrs, in_axes=(None,0))
+    input_attrs = node_attr_func(input_keys)
+    output_attrs = node_attr_func(output_keys)
+    hidden_attrs = genome.node_gene.new_custom_attrs(hidden_key)
 
-    return pop_nodes, pop_conns
+    nodes = nodes.at[input_idx, 1:].set(input_attrs)
+    nodes = nodes.at[output_idx, 1:].set(output_attrs)
+    nodes = nodes.at[new_node_key, 1:].set(hidden_attrs)
+
+    input_conns = jnp.c_[input_idx, jnp.full_like(input_idx, new_node_key)]
+    conns = conns.at[input_idx, 0:2].set(input_conns)
+    conns = conns.at[input_idx, 2].set(True)
+
+    output_conns = jnp.c_[jnp.full_like(output_idx, new_node_key), output_idx]
+    conns = conns.at[output_idx, 0:2].set(output_conns)
+    conns = conns.at[output_idx, 2].set(True)  
+
+    rand_keys_conns = jax.random.split(randkey, num=len(input_idx) + len(output_idx))
+    input_conn_keys, output_conn_keys = rand_keys_conns[:len(input_idx)], rand_keys_conns[len(input_idx):]
+
+    conn_attr_func = jax.vmap(genome.conn_gene.new_random_attrs, in_axes=(None,0))
+    input_conn_attrs = conn_attr_func(input_conn_keys)
+    output_conn_attrs = conn_attr_func(output_conn_keys)
+
+    conns = conns.at[input_idx, 3:].set(input_conn_attrs)
+    conns = conns.at[output_idx, 3:].set(output_conn_attrs)
+
+    return nodes, conns
+ 
+
+#random dense connections with 1 hidden layer
+def init_dense_hideen_layer( genome, randkey,hiddens=20):
+    k1, k2, k3 = jax.random.split(randkey, num=3)
+    input_idx, output_idx = genome.input_idx, genome.output_idx
+    input_size = len(input_idx)
+    output_size = len(output_idx)
+
+    hidden_idx = jnp.arange(input_size + output_size, input_size + output_size + hiddens)
+    nodes = jnp.full((genome.max_nodes, genome.node_gene.length), jnp.nan, dtype=jnp.float32)
+    nodes = nodes.at[input_idx, 0].set(input_idx)
+    nodes = nodes.at[output_idx, 0].set(output_idx)
+    nodes = nodes.at[hidden_idx, 0].set(hidden_idx)
+
+    total_idx = input_size + output_size + hiddens
+    rand_keys_n = jax.random.split(k1, num=total_idx)
+    input_keys = rand_keys_n[:input_size]
+    output_keys = rand_keys_n[input_size:input_size + output_size]
+    hidden_keys = rand_keys_n[input_size + output_size:]
+
+    node_attr_func = jax.vmap(genome.conn_gene.new_random_attrs, in_axes=(0))
+    input_attrs = node_attr_func(input_keys)
+    output_attrs = node_attr_func(output_keys)
+    hidden_attrs = node_attr_func(hidden_keys)
+
+    nodes = nodes.at[input_idx, 1:].set(input_attrs)
+    nodes = nodes.at[output_idx, 1:].set(output_attrs)
+    nodes = nodes.at[hidden_idx, 1:].set(hidden_attrs)
+
+    total_connections = input_size * hiddens + hiddens * output_size
+    conns = jnp.full((genome.max_conns, genome.conn_gene.length), jnp.nan, dtype=jnp.float32)
+
+    rand_keys_c = jax.random.split(k2, num=total_connections)
+    conns_attr_func = jax.vmap(genome.node_gene.new_random_attrs, in_axes=(0))
+    conns_attrs = conns_attr_func(rand_keys_c)
+
+    input_to_hidden_ids, hidden_ids = jnp.meshgrid(input_idx, hidden_idx, indexing='ij')
+    hidden_to_output_ids, output_ids = jnp.meshgrid(hidden_idx, output_idx, indexing='ij')
+
+    conns = conns.at[:input_size * hiddens, 0].set(input_to_hidden_ids.flatten())
+    conns = conns.at[:input_size * hiddens, 1].set(hidden_ids.flatten())
+    conns = conns.at[input_size * hiddens: total_connections, 0].set(hidden_to_output_ids.flatten())
+    conns = conns.at[input_size * hiddens: total_connections, 1].set(output_ids.flatten())
+    conns = conns.at[:input_size * hiddens + hiddens * output_size, 2].set(True)
+    conns = conns.at[:input_size * hiddens + hiddens * output_size, 3:].set(conns_attrs)
+
+    return nodes, conns
+
+# random sparse connections with no hidden nodes
+def init_no_hidden_random(genome, randkey):
+    k1, k2, k3 = jax.random.split(randkey, num=3)
+    input_idx, output_idx = genome.input_idx, genome.output_idx
+
+    nodes = jnp.full((genome.max_nodes, genome.node_gene.length), jnp.nan)
+    nodes = nodes.at[input_idx, 0].set(input_idx)
+    nodes = nodes.at[output_idx, 0].set(output_idx)
+
+    total_idx = len(input_idx) + len(output_idx)
+    rand_keys_n = jax.random.split(k1, num=total_idx)
+    input_keys = rand_keys_n[:len(input_idx)]
+    output_keys = rand_keys_n[len(input_idx):]
+
+    node_attr_func = jax.vmap(genome.node_gene.new_random_attrs, in_axes=(0))
+    input_attrs = node_attr_func(input_keys)
+    output_attrs = node_attr_func(output_keys)
+    nodes = nodes.at[input_idx, 1:].set(input_attrs)
+    nodes = nodes.at[output_idx, 1:].set(output_attrs)
+
+    conns = jnp.full((genome.max_conns, genome.conn_gene.length), jnp.nan)
+
+    num_connections_per_output = 4
+    total_connections = len(output_idx) * num_connections_per_output
+
+    def create_connections_for_output(key):
+        permuted_inputs = jax.random.permutation(key, input_idx)
+        selected_inputs = permuted_inputs[:num_connections_per_output]
+        return selected_inputs
+
+    conn_keys = jax.random.split(k2, num=len(output_idx))
+    connections = jax.vmap(create_connections_for_output)(conn_keys)
+    connections = connections.flatten()
+
+    output_repeats = jnp.repeat(output_idx, num_connections_per_output)
+
+    rand_keys_c = jax.random.split(k3, num=total_connections)
+    conns_attr_func = jax.vmap(genome.conn_gene.new_random_attrs, in_axes=(0))
+    conns_attrs = conns_attr_func(rand_keys_c)
+
+    conns = conns.at[:total_connections, 0].set(connections)
+    conns = conns.at[:total_connections, 1].set(output_repeats)
+    conns = conns.at[:total_connections, 2].set(True)  # enabled
+    conns = conns.at[:total_connections, 3:].set(conns_attrs)
+
+    return nodes, conns

tensorneat/pipeline.py

@@ -82,12 +82,13 @@ class Pipeline:
         state = ini_state
         compiled_step = jax.jit(self.step).lower(ini_state).compile()
 
-        for _ in range(self.generation_limit):
+        for w in range(self.generation_limit):
 
             self.generation_timestamp = time.time()
 
             previous_pop = self.algorithm.ask(state.alg)
 
+                
             state, fitnesses = compiled_step(state)
 
             fitnesses = jax.device_get(fitnesses)
@@ -102,7 +103,13 @@ class Pipeline:
             if max(fitnesses) >= self.fitness_target:
                 print("Fitness limit reached!")
                 return state, self.best_genome
-
+            node= previous_pop[0][0][:,0]
+            node_count = jnp.sum(~jnp.isnan(node))
+            conn= previous_pop[1][0][:,0]
+            conn_count = jnp.sum(~jnp.isnan(conn))
+            if(w%5==0):
+                print("node_count",node_count)
+                print("conn_count",conn_count)
         print("Generation limit reached!")
         return state, self.best_genome
 

tensorneat/problem/rl_env/rl_jit.py

@@ -9,32 +9,55 @@ class RLEnv(BaseProblem):
     jitable = True
 
     # TODO: move output transform to algorithm
-    def __init__(self):
+    def __init__(self, max_step=1000):
         super().__init__()
+        self.max_step = max_step
+
+    # def evaluate(self, randkey, state, act_func, params):
+    #     rng_reset, rng_episode = jax.random.split(randkey)
+    #     init_obs, init_env_state = self.reset(rng_reset)
+
+    #     def cond_func(carry):
+    #         _, _, _, done, _ = carry
+    #         return ~done
+
+    #     def body_func(carry):
+    #         obs, env_state, rng, _, tr = carry  # total reward
+    #         action = act_func(obs, params)
+    #         next_obs, next_env_state, reward, done, _ = self.step(rng, env_state, action)
+    #         next_rng, _ = jax.random.split(rng)
+    #         return next_obs, next_env_state, next_rng, done, tr + reward
+
+    #     _, _, _, _, total_reward = jax.lax.while_loop(
+    #         cond_func,
+    #         body_func,
+    #         (init_obs, init_env_state, rng_episode, False, 0.0)
+    #     )
+
+    #     return total_reward
 
     def evaluate(self, randkey, state, act_func, params):
         rng_reset, rng_episode = jax.random.split(randkey)
         init_obs, init_env_state = self.reset(rng_reset)
 
         def cond_func(carry):
-            _, _, _, done, _ = carry
-            return ~done
+            _, _, _, done, _, count = carry
+            return ~done & (count < self.max_step)  
 
         def body_func(carry):
-            obs, env_state, rng, _, tr = carry  # total reward
+            obs, env_state, rng, done, tr, count = carry  # tr -> total reward
             action = act_func(obs, params) 
             next_obs, next_env_state, reward, done, _ = self.step(rng, env_state, action) 
             next_rng, _ = jax.random.split(rng)  
-            return next_obs, next_env_state, next_rng, done, tr + reward
+            return next_obs, next_env_state, next_rng, done, tr + reward, count + 1
 
-        _, _, _, _, total_reward = jax.lax.while_loop(
+        _, _, _, _, total_reward, _ = jax.lax.while_loop(
             cond_func,
             body_func,
-            (init_obs, init_env_state, rng_episode, False, 0.0)
+            (init_obs, init_env_state, rng_episode, False, 0.0, 0)  
         )
 
         return total_reward  
-
     @partial(jax.jit, static_argnums=(0,))
     def step(self, randkey, env_state, action):
         return self.env_step(randkey, env_state, action)

tensorneat/utils/activation.py

@@ -11,7 +11,7 @@ class Act:
 
     @staticmethod
     def tanh(z):
-        return jnp.tanh(z)
+        return jnp.tanh(0.6 * z)
 
     @staticmethod
     def sin(z):