move regalloc_network to regalloc/regalloc_network (google#64)

* move regalloc_network to regalloc/regalloc_network

* add back import in bc.gin

Author: yundiqian

compiler_opt/rl/regalloc/gin_configs/behavioral_cloning_nn_agent.gin

@@ -2,7 +2,7 @@ import gin.tf.external_configurables
 import compiler_opt.rl.constant
 import compiler_opt.rl.gin_external_configurables
 import compiler_opt.rl.regalloc.config
-import compiler_opt.rl.regalloc_network
+import compiler_opt.rl.regalloc.regalloc_network
 import tf_agents.agents.behavioral_cloning.behavioral_cloning_agent
 import tf_agents.networks.actor_distribution_network
 

compiler_opt/rl/regalloc/gin_configs/network.gin

@@ -1,6 +1,6 @@
 import compiler_opt.rl.gin_external_configurables
 import compiler_opt.rl.regalloc.config
-import compiler_opt.rl.regalloc_network
+import compiler_opt.rl.regalloc.regalloc_network
 
 regalloc.config.get_observation_processing_layer_creator.quantile_file_dir='compiler_opt/rl/regalloc/vocab'
 regalloc.config.get_observation_processing_layer_creator.with_sqrt = False

compiler_opt/rl/regalloc/gin_configs/ppo_nn_agent.gin

@@ -3,7 +3,7 @@ import compiler_opt.rl.constant
 import compiler_opt.rl.constant_value_network
 import compiler_opt.rl.gin_external_configurables
 import compiler_opt.rl.regalloc.config
-import compiler_opt.rl.regalloc_network
+import compiler_opt.rl.regalloc.regalloc_network
 import tf_agents.agents.ppo.ppo_agent
 import tf_agents.networks.actor_distribution_network
 

compiler_opt/rl/regalloc_network.py renamed to compiler_opt/rl/regalloc/regalloc_network.py

@@ -18,8 +18,8 @@
 import tensorflow_probability as tfp
 from tf_agents.specs import tensor_spec
 
-from compiler_opt.rl import regalloc_network
 from compiler_opt.rl.regalloc import config
+from compiler_opt.rl.regalloc import regalloc_network
 
 
 def _observation_processing_layer(obs_spec):