MCarlomagno

import 'package:download_button/services/download_service.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

class DownloadButton extends StatelessWidget {
  const DownloadButton({Key? key, required this.url}) : super(key: key);

  final String url;

  Future<void> _downloadFile() async {

MCarlomagno

class GymHandler(Handler):
      
      # ...
     
      def setup(self) -> None:
        self._task_id = self.context.task_manager.enqueue_task(self.task)
      # ...
      
      
class GymTask(Task):

MCarlomagno

class GymTask(Task):
 
    # ...
  
    def execute(self, *args: Any, **kwargs: Any) -> None:
        if not self._proxy_env.is_rl_agent_trained and not self.is_rl_agent_training:
            self._start_training()
        if self._proxy_env.is_rl_agent_trained and self.is_rl_agent_training:
            self._stop_training()
            

MCarlomagno

Action = Any
Observation = Any
Reward = float
Done = bool
Info = dict
Feedback = Tuple[Observation, Reward, Done, Info]
NB_STEPS = 500

class ProxyEnv(gym.Env):

MCarlomagno

class GymTask(Task):
    # ... 

    def _fit(self, proxy_env: ProxyEnv, nb_steps: int) -> None:
        """Fit the RL agent."""
        self._rl_agent.fit(proxy_env, nb_steps)
    
    # ... 
    
class MyRLAgent(RLAgent):

MCarlomagno

class PriceBandit:
    def __init__(self, price: float, beta_a: float = 1.0, beta_b: float = 1.0):
        self.price = price
        # default params imply a uniform random prior
        self.beta_a = beta_a
        self.beta_b = beta_b

    def sample(self) -> int:
        return round(np.random.beta(self.beta_a, self.beta_b))

MCarlomagno

pragma solidity >=0.7.0 <0.9.0;

contract Chat {

    struct Message {
        uint id;
        address from;
        string text;
    }
}

MCarlomagno

pragma solidity >=0.7.0 <0.9.0;

contract Chat {

    struct Message {
        uint id;
        address from;
        string message;
    }

MCarlomagno

pragma solidity >=0.7.0 <0.9.0;

contract Chat {
  
  // ...
  
  // We can use an autoincremental id for each new message.
  uint lastMessageId;
  
  function sendMessage(string _text) public {

MCarlomagno

pragma solidity >=0.7.0 <0.9.0;

contract Chat {
    
  // the list of old messages in the chat
  mapping(uint => Message) public messagesList;
  function listMessages() public constant returns (uint[]){
    
    // if the chat is empty
    if(lastMessageId == 0) {