!pip install aicrowd-cli > /dev/null

import os

AICROWD_DATASET_PATH = os.getenv("DATASET_PATH", os.getcwd()+"/13d77bb0-b325-4e95-a03b-833eb6694acd_a2_taxi_inputs.zip")
AICROWD_RESULTS_DIR = os.getenv("OUTPUTS_DIR", "results")

!unzip $AICROWD_DATASET_PATH

DATASET_DIR = 'inputs/'

import numpy as np

class TaxiEnv_HW2:
    def __init__(self, states, actions, probabilities, rewards, initial_policy):
        self.possible_states = states
        self._possible_actions = {st: ac for st, ac in zip(states, actions)}
        self._ride_probabilities = {st: pr for st, pr in zip(states, probabilities)}
        self._ride_rewards = {st: rw for st, rw in zip(states, rewards)}
        self.initial_policy = initial_policy
        self._verify()

    def _check_state(self, state):
        assert state in self.possible_states, "State %s is not a valid state" % state

    def _verify(self):
        """ 
        Verify that data conditions are met:
        Number of actions matches shape of next state and actions
        Every probability distribution adds up to 1 
        """
        ns = len(self.possible_states)
        for state in self.possible_states:
            ac = self._possible_actions[state]
            na = len(ac)

            rp = self._ride_probabilities[state]
            assert np.all(rp.shape == (na, ns)), "Probabilities shape mismatch"
        
            rr = self._ride_rewards[state]
            assert np.all(rr.shape == (na, ns)), "Rewards shape mismatch"

            assert np.allclose(rp.sum(axis=1), 1), "Probabilities don't add up to 1"

    def possible_actions(self, state):
        """ Return all possible actions from a given state """
        self._check_state(state)
        return self._possible_actions[state]

    def ride_probabilities(self, state, action):
        """ 
        Returns all possible ride probabilities from a state for a given action
        For every action a list with the returned with values in the same order as self.possible_states
        """
        actions = self.possible_actions(state)
        ac_idx = actions.index(action)
        return self._ride_probabilities[state][ac_idx]

    def ride_rewards(self, state, action):
        actions = self.possible_actions(state)
        ac_idx = actions.index(action)
        return self._ride_rewards[state][ac_idx]

def check_taxienv():
    # These are the values as used in the pdf, but they may be changed during submission, so do not hardcode anything

    states = ['A', 'B', 'C']

    actions = [['1','2','3'], ['1','2'], ['1','2','3']]

    probs = [np.array([[1/2,  1/4,  1/4],
                    [1/16, 3/4,  3/16],
                    [1/4,  1/8,  5/8]]),

            np.array([[1/2,   0,     1/2],
                    [1/16,  7/8,  1/16]]),

            np.array([[1/4,  1/4,  1/2],
                    [1/8,  3/4,  1/8],
                    [3/4,  1/16, 3/16]]),]

    rewards = [np.array([[10,  4,  8],
                        [ 8,  2,  4],
                        [ 4,  6,  4]]),

            np.array([[14,  0, 18],
                        [ 8, 16,  8]]),

            np.array([[10,  2,  8],
                        [6,   4,  2],
                        [4,   0,  8]]),]
    initial_policy = {'A': '1', 'B': '1', 'C': '1'}

    env = TaxiEnv_HW2(states, actions, probs, rewards, initial_policy)
    print("All possible states", env.possible_states)
    print("All possible actions from state B", env.possible_actions('B'))
    print("Ride probabilities from state A with action 2", env.ride_probabilities('A', '2'))
    print("Ride rewards from state C with action 3", env.ride_rewards('C', '3'))

    base_kwargs = {"states": states, "actions": actions, 
                "probabilities": probs, "rewards": rewards,
                "initial_policy": initial_policy}
    return base_kwargs

base_kwargs = check_taxienv()
env = TaxiEnv_HW2(**base_kwargs)

# 1.1 Policy Iteration
def policy_iteration(taxienv, gamma):
    # A list of all the states
    states = taxienv.possible_states
    # Initial values
    values = {s: 0 for s in states}

    # This is a dictionary of states to policies -> e.g {'A': '1', 'B': '2', 'C': '1'}
    p = taxienv.initial_policy.copy()

    ## Begin code here

    # Hints - 
    # Do not hardcode anything
    # Only the final result is required for the results
    # Put any extra data in "extra_info" dictonary for any plots etc
    # Use the helper functions taxienv.ride_rewards, taxienv.ride_probabilities,  taxienv.possible_actions
    # For terminating condition use the condition exactly mentioned in the pdf
    all_values = [] # Append the "values" dictionary to this after each update
    all_policies = [] # Append the "policy" dictionary to this after each update
    
    # Put your extra information needed for plots etc in this dictionary
    extra_info = []
    done=False
    while(done==False):
     
      while(1):
        lamb=0
        extra_info.append(values.copy())
        for s in states:
          j=values[s]
          
          values[s] = sum(taxienv.ride_probabilities(s, p[s])*(taxienv.ride_rewards(s, p[s]) + list(gamma*np.array(list(values.values())))))
          
          lamb=max(lamb,abs(j-values[s]))
          #print(lamb)
        #print(lamb)
        if(lamb<0.00000001):
            break
      done=True
      for s in states:
        b=p[s]
        actions=taxienv.possible_actions(s)
        sum_dict = {a : 0 for a in actions}
        for a in actions:
          sum_dict[a] += sum(taxienv.ride_probabilities(s, a)*(taxienv.ride_rewards(s, a) + list(gamma*np.array(list(values.values())))))
        temp=float('-inf') 
        for i in sum_dict.keys():
          if(sum_dict[i]>temp):
            p[s]=i
            temp=sum_dict[i]
        if(b!=p[s]):
          done=False

    ## Do not edit below this line
    
    # Final results
    return {"Expected Reward": values, "Policy": p}, extra_info

# 1.2 Policy Iteration with different values of gamma
def run_policy_iteration(env):
    gamma_values = np.arange(5, 100, 5)/100
    results, extra_info = {}, {}
    for gamma in gamma_values:
        results[gamma], extra_info[gamma] = policy_iteration(env, gamma)
    return results, extra_info

results, extra_info = run_policy_iteration(env)

# 1.3 Modified Policy Iteration
def modified_policy_iteration(taxienv, gamma, m):
    # A list of all the states
    states = taxienv.possible_states
    # Initial values
    values = {s: 0 for s in states}
    
    # This is a dictionary of states to policies -> e.g {'A': '1', 'B': '2', 'C': '1'}
    p = taxienv.initial_policy.copy()
    
    ## Begin code here

    # Hints - 
    # Do not hardcode anything
    # Only the final result is required for the results
    # Put any extra data in "extra_info" dictonary for any plots etc
    # Use the helper functions taxienv.ride_rewards, taxienv.ride_probabilities,  taxienv.possible_actions
    # For terminating condition use the condition exactly mentioned in the pdf
    all_values = [] # Append the "values" dictionary to this after each update
    all_policies = [] # Append the "policy" dictionary to this after each update
    
    # Put your extra information needed for plots etc in this dictionary
    extra_info =[]
    done=False
    while(done==False):
      
      for itr in range(0,m+1):
        for s in states:
          j=values[s]
          extra_info.append(values.copy())
          values[s] = sum(taxienv.ride_probabilities(s, p[s])*(taxienv.ride_rewards(s, p[s]) + list(gamma*np.array(list(values.values())))))
      done=True
      for s in states:
        b=p[s]
        actions=taxienv.possible_actions(s)
        sum_dict = {a : 0 for a in actions}
        for a in actions:
          sum_dict[a] += sum(taxienv.ride_probabilities(s, a)*(taxienv.ride_rewards(s, a) + list(gamma*np.array(list(values.values())))))
        temp=float('-inf') 
        for i in sum_dict.keys():
          if(sum_dict[i]>temp):
            p[s]=i
            temp=sum_dict[i]
        if(b!=p[s]):
          done=False

    
    ## Do not edit below this line


    # Final results
    return {"Expected Reward": values, "Policy": p}, extra_info

def run_modified_policy_iteration(env):
    m_values = np.arange(1, 15)
    gamma = 0.9
    results, extra_info = {}, {}
    for m in m_values:
        results[m], extra_info[m] = modified_policy_iteration(env, gamma, m)
    return results, extra_info

results, extra_info_mpi = run_modified_policy_iteration(env)

# 1.4 Value Iteration
def value_iteration(taxienv, gamma):


  # A list of all the states
  states = taxienv.possible_states
  # Initial values
  values = {s: 0 for s in states}

  # This is a dictionary of states to policies -> e.g {'A': '1', 'B': '2', 'C': '1'}
  p = taxienv.initial_policy.copy()

  ## Begin code here

  # Hints - 
  # Do not hardcode anything
  # Only the final result is required for the results
  # Put any extra data in "extra_info" dictonary for any plots etc
  # Use the helper functions taxienv.ride_rewards, taxienv.ride_probabilities,  taxienv.possible_actions
  # For terminating condition use the condition exactly mentioned in the pdf
  all_values = [] # Append the "values" dictionary to this after each update
  all_policies = [] # Append the "policy" dictionary to this after each update
  
  # Put your extra information needed for plots etc in this dictionary
  extra_info = []
  
  H={s: 0 for s in states}
  l=0

  while(1):
    #print(values)
    l=0
    extra_info.append(values.copy())
    for s in states:
      actions=taxienv.possible_actions(s)
      sum_dict = {a : 0 for a in actions}
      temp=float('-inf')
      #print(actions,len(actions))
      for a in actions:
        t1=taxienv.ride_probabilities(s, a)
        t2=taxienv.ride_rewards(s, a)
        for i in range(len(states)):
          sum_dict[a] += t1[i]*(t2[i]+gamma*values[states[i]])
        
        if(sum_dict[a]>temp):
          temp=sum_dict[a]
          p[s]=a
      #print(sum_dict,p[s],temp)
      H[s]=temp
      l=max(l,abs(values[s]-H[s]))
    for s in states:
      values[s]=H[s]
    if(l<0.00000001):
      break
    #print(values)
    
    #print("s")
  #print(values)
  return {"Expected Reward": values, "Policy": p}, extra_info

def run_value_iteration(env):
    gamma_values = np.arange(5, 100, 5)/100
    results = {}
    results, extra_info1 = {}, {}
    for gamma in gamma_values:
        results[gamma], extra_info1[gamma] = value_iteration(env, gamma)
    return results, extra_info
  
results, extra_info1 = run_value_iteration(env)
(results)

# 1.4 Gauss Seidel Value Iteration
def gauss_seidel_value_iteration(taxienv, gamma):
    # A list of all the states
    states = taxienv.possible_states
    # Initial values
    values = {s: 0 for s in states}

    # This is a dictionary of states to policies -> e.g {'A': '1', 'B': '2', 'C': '1'}
    p = taxienv.initial_policy.copy()

    ## Begin code here

    # Hints - 
    # Do not hardcode anything
    # Only the final result is required for the results
    # Put any extra data in "extra_info" dictonary for any plots etc
    # Use the helper functions taxienv.ride_rewards, taxienv.ride_probabilities,  taxienv.possible_actions
    # For terminating condition use the condition exactly mentioned in the pdf
    all_values = [] # Append the "values" dictionary to this after each update
    all_policies = [] # Append the "policy" dictionary to this after each update
    
    # Put your extra information needed for plots etc in this dictionary
    extra_info = []
    H={s: float('-inf') for s in states}
  
    while(1):
      l=0
      extra_info.append(values.copy())
      for s in states:
        j_old=values[s]
        actions=taxienv.possible_actions(s)
        sum_dict = {a : 0 for a in actions}
        temp=float('-inf') 
        for a in actions:
          sum_dict[a] = sum(taxienv.ride_probabilities(s, a)*(taxienv.ride_rewards(s, a) + list(gamma*np.array(list(values.values())))))
          if(sum_dict[a]>temp):
            temp=sum_dict[a]
            p[s]=a
        values[s]=temp
        l=max(l,abs(values[s]-j_old))
        #print(l)
      if(l<0.00000001):
        break
    
    return {"Expected Reward": values, "Policy": p}, extra_info

def run_gauss_seidel_value_iteration(env):
    gamma_values = np.arange(5, 100, 5)/100
    results = {}
    results, extra_info2 = {}, {}
    for gamma in gamma_values:
        results[gamma], extra_info[gamma] = gauss_seidel_value_iteration(env, gamma)
    return results, extra_info

results, extra_info2 = run_gauss_seidel_value_iteration(env)
results

# Do not edit this cell
def get_results(kwargs):

    taxienv = TaxiEnv_HW2(**kwargs)

    policy_iteration_results = run_policy_iteration(taxienv)[0]
    modified_policy_iteration_results = run_modified_policy_iteration(taxienv)[0]
    value_iteration_results = run_value_iteration(taxienv)[0]
    gs_vi_results = run_gauss_seidel_value_iteration(taxienv)[0]

    final_results = {}
    final_results["policy_iteration"] = policy_iteration_results
    final_results["modifed_policy_iteration"] = modified_policy_iteration_results
    final_results["value_iteration"] = value_iteration_results
    final_results["gauss_seidel_iteration"] = gs_vi_results

    return final_results

# Do not edit this cell, generate results with it as is
if not os.path.exists(AICROWD_RESULTS_DIR):
    os.mkdir(AICROWD_RESULTS_DIR)

for params_file in os.listdir(DATASET_DIR):
  kwargs = np.load(os.path.join(DATASET_DIR, params_file), allow_pickle=True).item()
  results = get_results(kwargs)
  idx = params_file.split('_')[-1][:-4]
  np.save(os.path.join(AICROWD_RESULTS_DIR, 'results_' + idx), results)

# Check your score on the given test cases (There are more private test cases not provided)
target_folder = 'targets'
result_folder = AICROWD_RESULTS_DIR

def check_algo_match(results, targets):
    param_matches = []
    for k in results:
        param_results = results[k]
        param_targets = targets[k]
        policy_match = param_results['Policy'] == param_targets['Policy']
        rv = [v for k, v in param_results['Expected Reward'].items()]
        tv = [v for k, v in param_targets['Expected Reward'].items()]
        rewards_match = np.allclose(rv, tv, rtol=3)
        equal = rewards_match and policy_match
        param_matches.append(equal)
    return np.mean(param_matches)

def check_score(target_folder, result_folder):
    match = []
    for out_file in os.listdir(result_folder):
        res_file = os.path.join(result_folder, out_file)
        results = np.load(res_file, allow_pickle=True).item()
        idx = out_file.split('_')[-1][:-4]  # Extract the file number
        target_file = os.path.join(target_folder, f"targets_{idx}.npy")
        targets = np.load(target_file, allow_pickle=True).item()
        algo_match = []
        for k in targets:
            algo_results = results[k]
            algo_targets = targets[k]
            algo_match.append(check_algo_match(algo_results, algo_targets))
        match.append(np.mean(algo_match))
    return np.mean(match)

if os.path.exists(target_folder):
    print("Shared data Score (normalized to 1):", check_score(target_folder, result_folder))

import matplotlib.pyplot as plt
#lamda =0 
extra_info_pi=extra_info[0.05]
diffs1 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs1.append(diff)

#lamda =0.25
extra_info_pi=extra_info[0.25]
diffs2 = []

for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs2.append(diff)


#lamda =0.5
extra_info_pi=extra_info[0.5]
diffs3 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs3.append(diff)
#lamda =0.75
extra_info_pi=extra_info[0.75]
diffs4 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs4.append(diff)

#lamda =0.90
extra_info_pi=extra_info[0.90]
diffs5 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs5.append(diff)
plt.plot(diffs1)
plt.plot(diffs2)
plt.plot(diffs3)
plt.plot(diffs4)
plt.plot(diffs5)
plt.xlabel('iterations')
plt.ylabel('Loss')
plt.legend(["lamdda 0.0", "lamdda 0.25","lamdda 0.50","lamdda 0.75","lamdda 0.90"])
plt.show()

import matplotlib.pyplot as plt
#m =3 
extra_info_pi=extra_info_mpi[3]
diffs1 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs1.append(diff)

#m =6
extra_info_pi=extra_info_mpi[6]
diffs2 = []

for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs2.append(diff)


#lamda =9
extra_info_pi=extra_info_mpi[9]
diffs3 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs3.append(diff)
#lamda =10
extra_info_pi=extra_info_mpi[10]
diffs4 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs4.append(diff)

#lamda =12
extra_info_pi=extra_info_mpi[12]
diffs5 = []
for ii in range(0,len(extra_info_pi)):
    diff = np.linalg.norm(np.array(list(extra_info_pi[ii].values())) - np.array(list(extra_info_pi[len(extra_info_pi)-1].values())))/10
    diffs5.append(diff)
plt.plot(diffs1)
plt.plot(diffs2)
plt.plot(diffs3)
plt.plot(diffs4)
plt.plot(diffs5)
plt.xlabel('iterations')
plt.ylabel('loss')
plt.legend(["m = 3", "m = 6","m =9","m = 10","m = 12"])
plt.show()

#error plot
#gamma =0.05
import matplotlib.pyplot as plt
extra_info_1=extra_info1[0.95]
extra_info_2=extra_info2[0.95]

diffs1 = []
for ii in range(0,len(extra_info_1)):
    diff = np.linalg.norm(np.array(list(extra_info_1[ii].values())) - np.array(list(extra_info_1[len(extra_info_1)-1].values())))/10
    diffs1.append(diff)
diffs2 = []
for ii in range(0,len(extra_info_2)):
    diff = np.linalg.norm(np.array(list(extra_info_2[ii].values())) - np.array(list(extra_info_2[len(extra_info_2)-1].values())))/10
    diffs2.append(diff)
plt.plot(diffs1,'r')
plt.plot(diffs2,'b')
plt.legend(["VI", "Gauss Seidel"])
plt.show()
print(diffs1)
print(diffs2)

!DATASET_PATH=$AICROWD_DATASET_PATH aicrowd notebook submit -c iit-m-rl-assignment-2-taxi -a assets