Reduce memory sizes

config/sac_trainer_config.yaml

     learning_rate: 3.0e-4
     learning_rate_schedule: constant
     max_steps: 5.0e5
-    memory_size: 256
+    memory_size: 128
     normalize: false
     num_update: 1
     train_interval: 1
     sequence_length: 32
     num_layers: 2
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     init_entcoef: 0.1
     max_steps: 1.0e7
     summary_freq: 1000
     sequence_length: 32
     num_layers: 1
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     gamma: 0.99
     batch_size: 64
     max_steps: 1.0e7
     sequence_length: 32
     num_layers: 1
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     gamma: 0.99
     buffer_size: 1024
     batch_size: 64

config/trainer_config.yaml

     learning_rate: 3.0e-4
     learning_rate_schedule: linear
     max_steps: 5.0e5
-    memory_size: 256
+    memory_size: 128
     normalize: false
     num_epoch: 3
     num_layers: 2
     sequence_length: 64
     num_layers: 2
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     beta: 1.0e-2
     num_epoch: 3
     buffer_size: 1024
     sequence_length: 64
     num_layers: 1
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     beta: 1.0e-2
     num_epoch: 3
     buffer_size: 1024
     sequence_length: 32
     num_layers: 1
     hidden_units: 128
-    memory_size: 256
+    memory_size: 128
     beta: 1.0e-2
     num_epoch: 3
     buffer_size: 1024