feat: call v2 endpoints

[jmoralez]

• Changes all methods to target the v2 endpoints from the API, which are faster and require smaller payloads.
• Moves the distributed logic to the nixtla_client
• Removes the following deprecated symbols:
  • TimeGPT class
  • NixtlaClient.validate_token
  • short-horizon and long-horizon models

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Experiment Results

## Experiment 1: air-passengers ### Description: | variable | experiment | |:--------------|:-------------| | h | 12 | | season_length | 12 | | freq | MS | | level | None | | n_windows | 1 | ### Results: | metric | timegpt-1 | timegpt-1-long-horizon | SeasonalNaive | Naive | |:-----------|------------:|-------------------------:|----------------:|-----------:| | mae | 12.6793 | 11.0623 | 47.8333 | 76 | | mape | 0.027 | 0.0232 | 0.0999 | 0.1425 | | mse | 213.936 | 199.132 | 2571.33 | 10604.2 | | total_time | 2.4331 | 1.8206 | 0.006 | 0.0043 | ### Plot:  ## Experiment 2: air-passengers ### Description: | variable | experiment | |:--------------|:-------------| | h | 24 | | season_length | 12 | | freq | MS | | level | None | | n_windows | 1 | ### Results: | metric | timegpt-1 | timegpt-1-long-horizon | SeasonalNaive | Naive | |:-----------|------------:|-------------------------:|----------------:|-----------:| | mae | 58.1031 | 58.4587 | 71.25 | 115.25 | | mape | 0.1257 | 0.1267 | 0.1552 | 0.2358 | | mse | 4040.21 | 4110.79 | 5928.17 | 18859.2 | | total_time | 1.989 | 1.6506 | 0.0045 | 0.0041 | ### Plot:  ## Experiment 3: electricity-multiple-series ### Description: | variable | experiment | |:--------------|:-------------| | h | 24 | | season_length | 24 | | freq | H | | level | None | | n_windows | 1 | ### Results: | metric | timegpt-1 | timegpt-1-long-horizon | SeasonalNaive | Naive | |:-----------|------------:|-------------------------:|----------------:|---------------:| | mae | 178.293 | 268.121 | 269.23 | 1331.02 | | mape | 0.0234 | 0.0311 | 0.0304 | 0.1692 | | mse | 121588 | 219457 | 213677 | 4.68961e+06 | | total_time | 1.6659 | 1.7757 | 0.0055 | 0.005 | ### Plot:  ## Experiment 4: electricity-multiple-series ### Description: | variable | experiment | |:--------------|:-------------| | h | 168 | | season_length | 24 | | freq | H | | level | None | | n_windows | 1 | ### Results: | metric | timegpt-1 | timegpt-1-long-horizon | SeasonalNaive | Naive | |:-----------|------------:|-------------------------:|----------------:|---------------:| | mae | 465.532 | 346.984 | 398.956 | 1119.26 | | mape | 0.062 | 0.0437 | 0.0512 | 0.1583 | | mse | 835120 | 403787 | 656723 | 3.17316e+06 | | total_time | 1.6845 | 1.5564 | 0.0057 | 0.0053 | ### Plot:  ## Experiment 5: electricity-multiple-series ### Description: | variable | experiment | |:--------------|:-------------| | h | 336 | | season_length | 24 | | freq | H | | level | None | | n_windows | 1 | ### Results: | metric | timegpt-1 | timegpt-1-long-horizon | SeasonalNaive | Naive | |:-----------|--------------:|-------------------------:|----------------:|---------------:| | mae | 558.649 | 459.769 | 602.926 | 1340.95 | | mape | 0.0697 | 0.0566 | 0.0787 | 0.17 | | mse | 1.22721e+06 | 739135 | 1.61572e+06 | 6.04619e+06 | | total_time | 1.878 | 1.552 | 0.0058 | 0.0052 | ### Plot: