Пример #1
0
def run_exp_parse_args():
    parser = argparse.ArgumentParser(description='MINOS DFP experiment')
    add_sim_args(parser)
    parser.add_argument('mode', help='Experiment mode (train|test|show)')
    parser.add_argument('--gpu',
                        action='store_true',
                        help='Whether to use GPU')
    parser.add_argument('--test_checkpoint',
                        type=str,
                        default='',
                        help='Checkpoint directory to load for testing')
    parser.add_argument('--test_checkpoint_range',
                        type=str,
                        default=None,
                        help='Checkpoint range filter: e.g. [100000-150000]')
    parser.add_argument('--test_dataset',
                        type=str,
                        default='val',
                        help='Dataset on which to perform testing')
    parser.add_argument('--episodes_per_scene_test',
                        type=int,
                        default=1,
                        help='Episodes per scene during testing')
    parser.set_defaults(width=84,
                        height=84,
                        color_encoding='gray',
                        num_simulators=4)
    args = parser.parse_args()
    if args.mode == 'test' or args.mode == 'show':
        args.num_simulators = 1
    if args.log_action_trace:
        args.actionTraceLogFields = ['forces']
    args = sim_config.get(args.env_config, vars(args))
    return args
Пример #2
0
    def __init__(self, env_name, env_args, termination_time, thread_index):
        environment.Environment.__init__(self)
        try:
            self.last_state = None
            self.last_action = 0
            self.last_reward = 0

            self.prev_state = None
            self.prev_action = 0
            self.prev_reward = 0

            simargs = sim_config.get(env_name)
            simargs['id'] = 'sim%02d' % thread_index
            simargs['logdir'] = os.path.join(IndoorEnvironment.get_log_dir(),
                                             simargs['id'])

            # Merge in extra env args
            if env_args is not None:
                simargs.update(env_args)

            simargs["measure_fun"].termination_time = termination_time

            self.termination_time = termination_time

            # try:
            self._sim = RoomSimulator(simargs)
            self._sim_obs_space = self._sim.get_observation_space(
                simargs['outputs'])
            self.reset()
        except Exception as e:
            print("Error in indoor_env init():", str(e))  #, flush=True)
            raise Exception
Пример #3
0
def parse_sim_args(parser):
    add_sim_args(parser)
    args = parser.parse_args()

    if len(args.scene_ids) == 1:
        if args.scene_ids[0].endswith('txt'):
            # Read scene ids from file
            args.scene_ids = read_lines(args.scene_ids[0])
        elif args.scene_ids[0].endswith('csv'):
            # Read scene ids from file
            csvfile = args.scene_ids[0]
            with open(csvfile) as f:
                reader = csv.DictReader(f)
                args.scene_ids = [r.get('id') for r in reader]

    script_path = os.path.dirname(os.path.realpath(__file__))
    replace_doors_file = os.path.join(script_path, './replace_doors.json')
    with open(replace_doors_file, 'r') as f:
        replace_doors = json.load(f)
    if args.depth_noise:
        args.sensors = [{'name': 'depth', 'noise': True}]
    args.observations = {'color': True, 'depth': args.depth, 'forces': args.forces, 'audio': args.audio}
    for s in args.sensors:
        args.observations[s] = True
    args.collision_detection = {'mode': args.collision_mode}
    args.scene = {'fullId': args.source + '.' + args.scene_ids[0],
                  'room': args.room,
                  'archOnly': args.arch_only, 'emptyRoom': args.empty_room,
                  'retexture': args.retexture,
                  'texturedObjects': 'all',
                  'textureSet': args.texture_set,
                  'enableMirrors': args.mirrors,
                  'hideCategories': ['person', 'plant'], 'replaceModels': replace_doors,
                  'createArch': True,
                  'format': args.scene_format}
    if args.source == 'p5dScene':
        args.scene['defaultModelFormat'] = 'obj'
        args.scene['defaultSceneFormat'] = 'suncg'

    if args.add_object_at_goal:
        # print('add object at goal')
        args.modifications = [{
            'name': 'add',
            'modelIds': 'p5d.s__1957',
            'format': 'obj',
            'positionAt': 'goal'
        }]

    args.goal = get_goal_for_task(args.task)
    args.audio = {'debug': args.debug, 'debug_memory': args.debug_audio_memory}
    args.actionTraceLogFields = ['forces']
    args.auto_start = not args.manual_start
    if not args.auto_start:
        args.audio = {'port': 1112}
        args.port = 4899

    sim_args = sim_config.get(args.env_config, vars(args))
    sim_args = edict(sim_args)
    return sim_args
Пример #4
0
def main():
    parser = argparse.ArgumentParser(description='MINOS gym wrapper')
    add_sim_args_basic(parser)
    parser.add_argument('--env_config',
                        default='objectgoal_suncg_sf',
                        help='Environment configuration file')
    args = parser.parse_args()
    sim_args = sim_config.get(args.env_config, vars(args))
    run_gym(sim_args)
Пример #5
0
    def __init__(self, display_size):
        pygame.init()

        self.surface = pygame.display.set_mode(display_size, 0, 24)
        name = 'UNREAL' if flags.segnet == 0 else "A3C ErfNet"
        pygame.display.set_caption(name)

        env_config = sim_config.get(flags.env_name)
        self.image_shape = [
            env_config.get('height', 88),
            env_config.get('width', 88)
        ]
        segnet_param_dict = {'segnet_mode': flags.segnet}
        is_training = tf.placeholder(tf.bool, name="training")
        map_file = env_config.get('objecttypes_file', '../../objectTypes.csv')
        self.label_mapping = pd.read_csv(map_file, sep=',', header=0)
        self.get_col_index()

        self.action_size = Environment.get_action_size(flags.env_type,
                                                       flags.env_name)
        self.objective_size = Environment.get_objective_size(
            flags.env_type, flags.env_name)
        self.global_network = UnrealModel(self.action_size,
                                          self.objective_size,
                                          -1,
                                          flags.use_lstm,
                                          flags.use_pixel_change,
                                          flags.use_value_replay,
                                          flags.use_reward_prediction,
                                          0.0,
                                          0.0,
                                          "/gpu:0",
                                          segnet_param_dict=segnet_param_dict,
                                          image_shape=self.image_shape,
                                          is_training=is_training,
                                          n_classes=flags.n_classes,
                                          segnet_lambda=flags.segnet_lambda,
                                          dropout=flags.dropout,
                                          for_display=True)
        self.environment = Environment.create_environment(
            flags.env_type,
            flags.env_name,
            flags.termination_time_sec,
            env_args={
                'episode_schedule': flags.split,
                'log_action_trace': flags.log_action_trace,
                'max_states_per_scene': flags.episodes_per_scene,
                'episodes_per_scene_test': flags.episodes_per_scene
            })
        self.font = pygame.font.SysFont(None, 20)
        self.value_history = ValueHistory()
        self.state_history = StateHistory()
        self.episode_reward = 0
Пример #6
0
def parse_sim_args(parser):
    add_sim_args(parser)
    args = parser.parse_args()

    if len(args.scene_ids) == 1:
        if args.scene_ids[0].endswith('txt'):
            # Read scene ids from file
            args.scene_ids = read_lines(args.scene_ids[0])
        elif args.scene_ids[0].endswith('csv'):
            # Read scene ids from file
            csvfile = args.scene_ids[0]
            with open(csvfile) as f:
                reader = csv.DictReader(f)
                args.scene_ids = [r.get('id') for r in reader]

    if args.depth_noise:
        args.sensors = [{'name': 'depth', 'noise': True}]
    args.observations = {
        'color': True,
        'rightcamera': True,
        'depthright': True,
        'leftcamera': True,
        'depthleft': True,
        'depth': args.depth,
        'forces': args.forces,
        'audio': args.audio
    }
    for s in args.sensors:
        args.observations[s] = True
    args.collision_detection = {'mode': args.collision_mode}
    if args.add_object_at_goal:
        # print('add object at goal')
        args.modifications = [{
            'name': 'add',
            'modelIds': 'p5d.s__1957',
            'format': 'obj',
            'positionAt': 'goal'
        }]

    args.audio = {'debug': args.debug, 'debug_memory': args.debug_audio_memory}
    args.actionTraceLogFields = ['forces']
    args.auto_start = not args.manual_start
    if not args.auto_start:
        args.audio = {'port': 1112}
        args.port = 4899

    sim_args = sim_config.get(args.env_config, vars(args))
    sim_args = edict(sim_args)
    return sim_args
Пример #7
0
  def __init__(self):
    self.action_size = Environment.get_action_size(flags.env_type, flags.env_name)
    self.objective_size = Environment.get_objective_size(flags.env_type, flags.env_name)

    env_config = sim_config.get(flags.env_name)
    self.image_shape = [env_config['height'], env_config['width']]
    segnet_param_dict = {'segnet_mode': flags.segnet}
    is_training = tf.placeholder(tf.bool, name="training") # for display param in UnrealModel says its value

    self.global_network = UnrealModel(self.action_size,
                                      self.objective_size,
                                      -1,
                                      flags.use_lstm,
                                      flags.use_pixel_change,
                                      flags.use_value_replay,
                                      flags.use_reward_prediction,
                                      0.0, #flags.pixel_change_lambda
                                      0.0, #flags.entropy_beta
                                      device,
                                      segnet_param_dict=segnet_param_dict,
                                      image_shape=self.image_shape,
                                      is_training=is_training,
                                      n_classes=flags.n_classes,
                                      segnet_lambda=flags.segnet_lambda,
                                      dropout=flags.dropout,
                                      for_display=True)
    self.environment = Environment.create_environment(flags.env_type, flags.env_name, flags.termination_time_sec,
                                                      env_args={'episode_schedule': flags.split,
                                                                'log_action_trace': flags.log_action_trace,
                                                                'max_states_per_scene': flags.episodes_per_scene,
                                                                'episodes_per_scene_test': flags.episodes_per_scene})

    self.global_network.prepare_loss()

    self.total_loss = []
    self.segm_loss = []
    self.episode_reward = [0]
    self.episode_roomtype = []
    self.roomType_dict  = {}
    self.segnet_class_dict = {}
    self.success_rate = []
    self.batch_size = 20
    self.batch_cur_num = 0
    self.batch_prev_num = 0
    self.batch_si = []
    self.batch_sobjT = []
    self.batch_a = []
    self.batch_reward = []
Пример #8
0
  def __init__(self, env_name, env_args, thread_index):
    environment.Environment.__init__(self)
    
    self.last_state = None
    self.last_action = 0
    self.last_reward = 0

    simargs = sim_config.get(env_name)
    simargs['id'] = 'sim%02d' % thread_index
    simargs['logdir'] = os.path.join(IndoorEnvironment.get_log_dir(), simargs['id'])

    # Merge in extra env args
    if env_args is not None:
      simargs.update(env_args)

    self._sim = RoomSimulator(simargs)
    self._sim_obs_space = self._sim.get_observation_space(simargs['outputs'])
    self.reset()
Пример #9
0
def main():
    parser = argparse.ArgumentParser(description='MINOS gym wrapper')
    add_sim_args_basic(parser)
    parser.add_argument('--env_config',
                        default='objectgoal_suncg_sf',
                        help='Environment configuration file')
    args = parser.parse_args()
    sim_args = sim_config.get(args.env_config, vars(args))
    sim = RoomSimulator(sim_args)
    common.attach_exit_handler(sim.sim)
    try:
        print('Starting RoomSimulator...')
        sim.init()
        print('RoomSimulator started.')
        interactive_loop(sim, args)
    except:
        traceback.print_exc()
        print('Error running simulator. Aborting.')

    if sim is not None:
        sim.close_game()
        del sim
Пример #10
0
 def get_objective_size(env_name):
   simargs = sim_config.get(env_name)
   return simargs.get('objective_size', 0)
Пример #11
0
  def run(self):
    device = "/cpu:0"
    if USE_GPU:
      device = "/gpu:0"

    self.print_flags_info()

    if flags.segnet == -1:
      with open(flags.segnet_config) as f:
        self.config = json.load(f)

      self.num_classes = self.config["NUM_CLASSES"]
      self.use_vgg = self.config["USE_VGG"]

      if self.use_vgg is False:
        self.vgg_param_dict = None
        print("No VGG path in config, so learning from scratch")
      else:
        self.vgg16_npy_path = self.config["VGG_FILE"]
        self.vgg_param_dict = np.load(self.vgg16_npy_path, encoding='latin1').item()
        print("VGG parameter loaded")

      self.bayes = self.config["BAYES"]
      segnet_param_dict = {'segnet_mode': flags.segnet, 'vgg_param_dict': self.vgg_param_dict, 'use_vgg': self.use_vgg,
                       'num_classes': self.num_classes, 'bayes': self.bayes}
    else: # 0, 1, 2, 3
      segnet_param_dict = {'segnet_mode': flags.segnet}

    if flags.env_type != 'indoor':
        env_config = {}
    else:
        env_config = sim_config.get(flags.env_name)
    self.image_shape = [env_config.get('height', 84), env_config.get('width', 84)]
    self.map_file = env_config.get('objecttypes_file', '../../objectTypes_1x.csv')
    
    initial_learning_rate = log_uniform(flags.initial_alpha_low,
                                        flags.initial_alpha_high,
                                        flags.initial_alpha_log_rate)
    self.global_t = 0
    
    self.stop_requested = False
    self.terminate_requested = False
    
    action_size = Environment.get_action_size(flags.env_type,
                                              flags.env_name)
    objective_size = Environment.get_objective_size(flags.env_type, flags.env_name)

    is_training = tf.placeholder(tf.bool, name="training")

    self.random_state = np.random.RandomState(seed=env_config.get("seed", 0xA3C))

    print("Global network initializing!")#, flush=True)

    self.global_network = UnrealModel(action_size,
                                      objective_size,
                                      -1,
                                      flags.use_lstm,
                                      flags.use_pixel_change,
                                      flags.use_value_replay,
                                      flags.use_reward_prediction,
                                      flags.pixel_change_lambda,
                                      flags.entropy_beta,
                                      device,
                                      segnet_param_dict=segnet_param_dict,
                                      image_shape=self.image_shape,
                                      is_training=is_training,
                                      n_classes=flags.n_classes,
                                      segnet_lambda=flags.segnet_lambda,
                                      dropout=flags.dropout)
    self.trainers = []
    
    learning_rate_input = tf.placeholder("float")

    
    grad_applier = RMSPropApplier(learning_rate = learning_rate_input,
                                  decay = flags.rmsp_alpha,
                                  momentum = 0.0,
                                  epsilon = flags.rmsp_epsilon,
                                  clip_norm = flags.grad_norm_clip,
                                  device = device)
    
    for i in range(flags.parallel_size):
      trainer = Trainer(i,
                        self.global_network,
                        initial_learning_rate,
                        learning_rate_input,
                        grad_applier,
                        flags.env_type,
                        flags.env_name,
                        flags.use_lstm,
                        flags.use_pixel_change,
                        flags.use_value_replay,
                        flags.use_reward_prediction,
                        flags.pixel_change_lambda,
                        flags.entropy_beta,
                        flags.local_t_max,
                        flags.n_step_TD,
                        flags.gamma,
                        flags.gamma_pc,
                        flags.experience_history_size,
                        flags.max_time_step,
                        device,
                        segnet_param_dict=segnet_param_dict,
                        image_shape=self.image_shape,
                        is_training=is_training,
                        n_classes = flags.n_classes,
                        random_state=self.random_state,
                        termination_time=flags.termination_time_sec,
                        segnet_lambda=flags.segnet_lambda,
                        dropout=flags.dropout)
      self.trainers.append(trainer)


    self.last_scores = []
    self.best_score = -1.0
    
    # prepare session
    config = tf.ConfigProto(allow_soft_placement = True, log_device_placement = False)
    config.gpu_options.allow_growth = True
    self.sess = tf.Session(config=config)

    # Wrap sess.run for debugging messages!
    def run_(*args, **kwargs):
      #print(">>> RUN!", args[0] if args else None)#, flush=True)
      return self.sess.__run(*args, **kwargs)  # getattr(self, "__run")(self, *args, **kwargs)
    self.sess.__run, self.sess.run = self.sess.run, run_

    self.sess.run(tf.global_variables_initializer())

    # summary for tensorboard
    self.score_input = tf.placeholder(tf.float32)
    self.sr_input = tf.placeholder(tf.float32)
    self.mIoU_input = tf.placeholder(tf.float32)
    self.term_global_t = tf.placeholder(tf.int32)

    self.losses_input = {}

    self.total_loss = tf.placeholder(tf.float32,  name='total_loss')
    self.losses_input.update({'all/total_loss': self.total_loss})

    self.base_loss = tf.placeholder(tf.float32, name='base_loss')
    self.losses_input.update({'all/base_loss': self.base_loss})

    self.policy_loss = tf.placeholder(tf.float32,  name='policy_loss')
    self.losses_input.update({'all/policy_loss': self.policy_loss})

    self.value_loss = tf.placeholder(tf.float32, name='policy_loss')
    self.losses_input.update({'all/value_loss': self.value_loss})

    self.grad_norm = tf.placeholder(tf.float32, name='grad_norm')
    self.losses_input.update({'all/loss/grad_norm': self.grad_norm})

    self.entropy_input = tf.placeholder(tf.float32, shape=[None], name='entropy')

    if segnet_param_dict["segnet_mode"] >= 2:
      self.decoder_loss = tf.placeholder(tf.float32,  name='decoder_loss')
      self.losses_input.update({'all/decoder_loss': self.decoder_loss})
      self.l2_weights_loss = tf.placeholder(tf.float32, name='regul_weights_loss')
      self.losses_input.update({'all/l2_weights_loss': self.l2_weights_loss})
    if flags.use_pixel_change:
      self.pc_loss = tf.placeholder(tf.float32,  name='pc_loss')
      self.losses_input.update({'all/pc_loss': self.pc_loss})
    if flags.use_value_replay:
      self.vr_loss = tf.placeholder(tf.float32,  name='vr_loss')
      self.losses_input.update({'all/vr_loss': self.vr_loss})
    if flags.use_reward_prediction:
      self.rp_loss = tf.placeholder(tf.float32,  name='rp_loss')
      self.losses_input.update({'all/rp_loss': self.rp_loss})

    score_summary = tf.summary.scalar("all/eval/score", self.score_input)
    sr_summary = tf.summary.scalar("all/eval/success_rate", self.sr_input)
    term_summary = tf.summary.scalar("all/eval/term_global_t", self.term_global_t)
    eval_summary = tf.summary.scalar("all/eval/mIoU_all", self.mIoU_input)
    losses_summary_list = []
    for key, val in self.losses_input.items():
      losses_summary_list += [tf.summary.scalar(key, val)]


    self.summary_op_dict = {'score_input': score_summary, 'eval_input': eval_summary, 'sr_input':sr_summary,
                            'losses_input': tf.summary.merge(losses_summary_list),
                            'entropy': tf.summary.scalar('all/eval/entropy_stepTD', tf.reduce_mean(self.entropy_input)),
                            'term_global_t': term_summary}
    flags.checkpoint_dir = os.path.join(base_dir, flags.checkpoint_dir)
    #print("First dirs {}::{}".format(flags.log_dir, flags.checkpoint_dir))
    flags.checkpoint_dir = flags.checkpoint_dir
    print("Checkpoint dir: {}, Log dir: {}".format(flags.checkpoint_dir, flags.log_dir))
    overall_FW = tf.summary.FileWriter(os.path.join(flags.log_dir, 'overall'),
                          self.sess.graph)
    self.summary_writer = [(tf.summary.FileWriter(os.path.join(flags.log_dir, 'worker_{}'.format(i)),
                                                self.sess.graph), overall_FW) for i in range(flags.parallel_size)]
    
    # init or load checkpoint with saver
    self.saver = tf.train.Saver(self.global_network.get_global_vars(), max_to_keep=20)


    
    #checkpoint = tf.train.get_checkpoint_state(flags.checkpoint_dir, latest_filename ="best-checkpoint")
    #if checkpoint is None or checkpoint.model_checkpoint_path is None:
    #  checkpoint = tf.train.get_checkpoint_state(flags.checkpoint_dir)
    checkpoint = tf.train.get_checkpoint_state(flags.checkpoint_dir)

    if checkpoint and checkpoint.model_checkpoint_path:
      if flags.segnet == -1:
          from tensorflow.python import pywrap_tensorflow
          reader = pywrap_tensorflow.NewCheckpointReader(checkpoint.model_checkpoint_path)
          big_var_to_shape_map = reader.get_variable_to_shape_map()
          s = []
          for key in big_var_to_shape_map:
              s += [key]
              # print("tensor_name: ", key)
          glob_var_names = [v.name for v in tf.global_variables()]
          endings = [r.split('/')[-1][:-2] for r in glob_var_names]
          old_ckpt_to_new_ckpt = {[k for k in s if endings[i] in k][0]: v for i, v in enumerate(tf.global_variables())}
          saver1 = tf.train.Saver(var_list=old_ckpt_to_new_ckpt)
          saver1.restore(self.sess, checkpoint.model_checkpoint_path)
      else:
          self.saver.restore(self.sess, checkpoint.model_checkpoint_path)
      print("checkpoint loaded:", checkpoint.model_checkpoint_path)
      tokens = checkpoint.model_checkpoint_path.split("-")
      # set global step
      if 'best' in checkpoint.model_checkpoint_path:
          files = os.listdir(flags.checkpoint_dir)
          max_g_step = 0
          max_best_score = -10
          for file in files:
            if '.meta' not in file or 'checkpoint' not in file:
              continue
            if len(tokens) == 2:
              continue
            if len(tokens) > 3:
              best_score = float('-0.'+file.split('-')[2]) if 'best' in file else float('-0.'+file.split('-')[1])
              if best_score > max_best_score:
                g_step = int(file.split('-')[3]).split('.')[0] if 'best' in file else int(file.split('-')[2].split('.')[0])
                if max_g_step < g_step:
                  max_g_step = g_step
            else:
              self.best_score = -1.0
              g_step = int(file.split('-')[2]) if 'best' in file else int(file.split('-')[1])
              if max_g_step < g_step:
                max_g_step = g_step
          self.best_score = max_best_score
          self.global_t = max_g_step
          print("Chosen g_step >>", g_step)
      else:
        if len(tokens) == 3:
          self.global_t = int(tokens[2])
        else:
          self.global_t = int(tokens[1])
      #for i in range(flags.parallel_size):
      #  self.trainers[i].local_t = self.global_t
      print(">>> global step set: ", self.global_t)
      # set wall time
      wall_t_fname = flags.checkpoint_dir + '/' + 'wall_t.' + str(self.global_t)
      with open(wall_t_fname, 'r') as f:
        self.wall_t = float(f.read())
        self.next_save_steps = (self.global_t + flags.save_interval_step) // flags.save_interval_step * flags.save_interval_step
      print_tensors_in_checkpoint_file(file_name=checkpoint.model_checkpoint_path,
                                     tensor_name='', all_tensors=False, all_tensor_names=True)
    else:
      print("Could not find old checkpoint")
      # set wall time
      self.wall_t = 0.0
      self.next_save_steps = flags.save_interval_step
    print("Global step {}, max best score {}".format(self.global_t, self.best_score))

    if flags.segnet_pretrain:
      checkpoint_dir = "../erfnet_segmentation/models"
      checkpoint_dir = os.path.join(checkpoint_dir, "aug_erfnetC_0_{}x{}_{}x/snapshots_best".format(
          self.image_shape[1],
          self.image_shape[0],
          self.map_file.split('_')[1].split('x')[0]))
      checkpoint = tf.train.get_checkpoint_state(checkpoint_dir)

      big_weights = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, scope='net_-1/base_encoder')
      big_weights += tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, scope='net_-1/base_decoder')

      erfnet_weights = [l.name.split(':')[0].rsplit('net_-1/base_encoder/')[-1] for l in big_weights
             if len(l.name.split(':')[0].rsplit('net_-1/base_encoder/')) == 2]
      erfnet_weights += [l.name.split(':')[0].rsplit('net_-1/base_decoder/')[-1] for l in big_weights
              if len(l.name.split(':')[0].rsplit('net_-1/base_decoder/')) == 2]

      if checkpoint and checkpoint.model_checkpoint_path:
          saver2 = tf.train.Saver(var_list=dict(zip(erfnet_weights, big_weights)))
          saver2.restore(self.sess, checkpoint.model_checkpoint_path)
          print("ErfNet pretrained weights restored from file ", checkpoint_dir)
      else:
          print("Can't load pretrained weights for ErfNet from file ", checkpoint_dir)

    # run training threads
    self.train_threads = []
    for i in range(flags.parallel_size):
      self.train_threads.append(threading.Thread(target=self.train_function, args=(i,True)))
      
    signal.signal(signal.SIGINT, self.signal_handler)
  
    # set start time
    self.start_time = time.time() - self.wall_t

    print("Ready to start")
    for t in self.train_threads:
      t.start()
  
    print('Press Ctrl+C to stop')#, flush=True)
    signal.pause()