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class MetaLearner:
  """
  This is nothing more than a regular learning flow. However, we create this 
  class, as we plan on using separate (meta-)learners for each task.
  """

  def __init__(self,
               model:torch.nn.Module,
               loss_fn:Callable,
               optimizer):

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class Reptile:
  """
  Repile-optimization as described by Ravi,et.al. (https://openreview.net/pdf?id=rJY0-Kcl)
  """
  def __init__(self,
               model:torch.nn.Module,
               metalearners:List[MetaLearner]):
    self.n_tasks = len(metalearners)
    self.model = model
    self.metalearners = metalearners

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 with tf.train.MonitoredTrainingSession(master=server.target,\
                                                    is_chief=is_chiefing,
                                                    checkpoint_dir=arsg['save_dir'],\
                                                    hooks=hooks,\
                                                    save_checkpoint_secs=600.)  as mon_sess:
    tf_feed = ctx.get_data_feed(train_mode=True)

    step = 0
    while not mon_sess.should_stop() and not tf_feed.should_stop() and step < args['steps']:
        batch_data, batch_labels = get_next_batch(tf_feed.next_batch(args['batch_size']))

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with tf.device(tf.train.replica_device_setter(
                    worker_device="/job:worker/task:%d" % task_index,
                    cluster=cluster)):

    def build_model():
        model_input = tf.placeholder(tf.float32,\
                    [None,args['num_features'] ])
        model_labels = tf.placeholder(tf.float32, [None, args['num_classes']    ])
        logits = tf.keras.layers.Dense(args['num_classes'])(model_input)
        model_output = tf.nn.softmax(logits)

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if mode == "train":
        cluster.train(dataRDD, epochs)
    else:
        labelRDD = cluster.inference(dataRDD)

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def map_fun(args, ctx):
    try:
        import tensorflow as tf
        
        #utils
        from datetime import datetime
        import time
        import logging
        import numpy as np
        

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from pyspark.sql import SparkSession
from tensorflowonspark import TFCluster, TFNode

spark = SparkSession \
        .builder \
        .config("...")
        .appName("model-training") \
        .getOrCreate()
    spark.sparkContext.addPyFile("/usr/local/tensorflow/tfspark-{version}.zip")
    

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def map_fun(args, ctx):
    worker_num = ctx.worker_num
    job_name = ctx.job_name
    task_index = ctx.task_index  
    cluster, server = ctx.start_cluster_server(1)
    if job_name == "ps":
        server.join()     
    elif job_name == "worker":
        is_chiefing = (task_index == 0)
        with tf.device(tf.train.replica_device_setter(

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cluster_spec = tf.train.ClusterSpec({'worker' : ['localhost:2222']})
server = tf.train.Server(cluster_spec)

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def RosenbrockOpt(optimizer,MAX_EPOCHS = 4000, MAX_STEP = 100):
	'''
	returns distance of each step*MAX_STEP w.r.t minimum (1,1)
	'''
	x1_data = tf.Variable(initial_value=tf.random_uniform([1], minval=-3, maxval=3,seed=0),name='x1')
	x2_data = tf.Variable(initial_value=tf.random_uniform([1], minval=-3, maxval=3,seed=1), name='x2')

	y = tf.add(tf.pow(tf.subtract(1.0, x1_data), 2.0),
	tf.multiply(100.0, tf.pow(tf.subtract(x2_data, tf.pow(x1_data, 2.0)), 2.0)), 'y')