Initialize a Malmo environment.
            xml - the mission xml.
            port - the MalmoEnv service's port.
            server - the MalmoEnv service address. Default is localhost.
            server2 - the MalmoEnv service address for given role if not 0.
            port2 - the MalmoEnv service port for given role if not 0.
            role - the agent role (0..N-1) for missions with N agents. Defaults to 0.
            exp_uid - the experiment's unique identifier. Generated if not given.
            episode - the "reset" start count for experiment re-starts. Defaults to 0.
            action_filter - an optional list of valid actions to filter by. Defaults to simple commands.
            step_options - encodes withTurnKey and withInfo in step messages. Defaults to info included,
            turn if required.

def init(self, xml, port, server=None,
             server2=None, port2=None,
             role=0, exp_uid=None, episode=0,
             action_filter=None, resync=0, step_options=0, action_space=None):
        """"Initialize a Malmo environment.
            xml - the mission xml.
            port - the MalmoEnv service's port.
            server - the MalmoEnv service address. Default is localhost.
            server2 - the MalmoEnv service address for given role if not 0.
            port2 - the MalmoEnv service port for given role if not 0.
            role - the agent role (0..N-1) for missions with N agents. Defaults to 0.
            exp_uid - the experiment's unique identifier. Generated if not given.
            episode - the "reset" start count for experiment re-starts. Defaults to 0.
            action_filter - an optional list of valid actions to filter by. Defaults to simple commands.
            step_options - encodes withTurnKey and withInfo in step messages. Defaults to info included,
            turn if required.
        """
        if action_filter is None:
            action_filter = {"move", "turn", "use", "attack"}

        if not xml.startswith('<Mission'):
            i = xml.index("<Mission")
            if i == -1:
                raise EnvException("Mission xml must contain <Mission> tag.")
            xml = xml[i:]

        self.xml = etree.fromstring(xml)
        self.role = role
        if exp_uid is None:
            self.exp_uid = str(uuid.uuid4())
        else:
            self.exp_uid = exp_uid

        command_parser = CommandParser(action_filter)
        commands = command_parser.get_commands_from_xml(self.xml, self.role)
        actions = command_parser.get_actions(commands)
        # print("role " + str(self.role) + " actions " + str(actions)

        if action_space:
            self.action_space = action_space
        else:
            self.action_space = ActionSpace(actions)

        self.port = port
        if server is not None:
            self.server = server
        if server2 is not None:
            self.server2 = server2
        else:
            self.server2 = self.server
        if port2 is not None:
            self.port2 = port2
        else:
            self.port2 = self.port + self.role

        self.agent_count = len(self.xml.findall(self.ns + 'AgentSection'))
        turn_based = self.xml.find('.//' + self.ns + 'TurnBasedCommands') is not None
        if turn_based:
            self.turn_key = 'AKWozEre'
        else:
            self.turn_key = ""
        if step_options is None:
            self.step_options = 0 if not turn_based else 2
        else:
            self.step_options = step_options
        self.done = True
        # print("agent count " + str(self.agent_count) + " turn based  " + turn_based)
        self.resync_period = resync
        self.resets = episode

        e = etree.fromstring("""<MissionInit xmlns="http://ProjectMalmo.microsoft.com" 
                                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
                                SchemaVersion="" PlatformVersion=""" + '\"' + malmo_version + '\"' +
                             """>
                                <ExperimentUID></ExperimentUID>
                                <ClientRole>0</ClientRole>
                                <ClientAgentConnection>
                                    <ClientIPAddress>127.0.0.1</ClientIPAddress>
                                    <ClientMissionControlPort>0</ClientMissionControlPort>
                                    <ClientCommandsPort>0</ClientCommandsPort>
                                    <AgentIPAddress>127.0.0.1</AgentIPAddress>
                                    <AgentMissionControlPort>0</AgentMissionControlPort>
                                    <AgentVideoPort>0</AgentVideoPort>
                                    <AgentDepthPort>0</AgentDepthPort>
                                    <AgentLuminancePort>0</AgentLuminancePort>
                                    <AgentObservationsPort>0</AgentObservationsPort>
                                    <AgentRewardsPort>0</AgentRewardsPort>
                                    <AgentColourMapPort>0</AgentColourMapPort>
                                    </ClientAgentConnection>
                                </MissionInit>""")
        e.insert(0, self.xml)
        self.xml = e
        self.xml.find(self.ns + 'ClientRole').text = str(self.role)
        self.xml.find(self.ns + 'ExperimentUID').text = self.exp_uid
        if self.role != 0 and self.agent_count > 1:
            e = etree.Element(self.ns + 'MinecraftServerConnection',
                              attrib={'address': self.server,
                                      'port': str(0)
                                      })
            self.xml.insert(2, e)

        video_producers = self.xml.findall('.//' + self.ns + 'VideoProducer')
        assert len(video_producers) == self.agent_count
        video_producer = video_producers[self.role]
        self.width = int(video_producer.find(self.ns + 'Width').text)
        self.height = int(video_producer.find(self.ns + 'Height').text)
        want_depth = video_producer.attrib["want_depth"]
        self.depth = 4 if want_depth is not None and (want_depth == "true" or want_depth == "1") else 3
        # print(str(self.width) + "x" + str(self.height) + "x" + str(self.depth))
        self.observation_space = VisualObservationSpace(self.width, self.height, self.depth)