`initial_weights`

argument is replaces by`init`

`init`

takes a named list and currently`intial_weights`

and`R0`

the initial weights and the initial cumulative regret can be provided. They have to be PxK or 1xK.

- Internal changes to improve readability
- Resolve C++ compilation warnings

- Remove unused C++17 dependency

- The
`profoc`

function was extended:`regret`

can now be passed as an array as before, or as a list, e.g.`list(regret = regret_array, share = 0.2)`

if the provided regret should be mixed with the regret calculated by online.`loss`

can also be provided as a list, see above.

- The
`batch`

function can now minimize an alternative objection function using the quantile weighted CRPS- This weighting scheme can be activated by setting
`qw_crps=TRUE`

- It defaults to FALSE due to better performance

- This weighting scheme can be activated by setting

- Changes to the splines2 package required some changes on our side. This affected the creation of the b-spline basis. See https://github.com/BerriJ/profoc/pull/3

- First release on CRAN
- The
`profoc`

function was renamed to`online`

for consistency. - Added
`batch`

function to apply batch-learning. - Added
`oracle`

function to approximate the oracle. - Update, predict, plot, and print methods were added for
`online`

and`batch`

objects.

- Unfortunately, we decided to apply significant changes to the API. This likely breaks old code. Please refer to the respective function documentation for more information.

- The b-spline basis is now calculated using a fast C++ function imported from the splines2 R package.
- The source code is now distributed across different files.

The spline functions where rewritten to add the ability of using a non-equidistant knot sequence and a penalty term defined on the Sobolev space. This change induces breaking changes to small parts of the API.

`ndiff`

defines the degree of differencing for creating the penalty term. For values between 1 and 2 a weighted sum of the difference penalization matrices is used.`rel_nseg`

is replaced by`knot_distance`

( distance between knots). Defaults to 0.025, which corresponds to the grid steps when knot_distance_power = 1 (the default).- A new parameter
`knot_distance_power`

defines if knots are uniformly distributed. Defaults to 1, which corresponds to the equidistant case. Values less than 1 create more knots in the center, while values above 1 concentrate more knots in the tails. - A new parameter
`allow_quantile_crossing`

defines if quantile crossing is allowed. Defaults to false, which means that predictions will be sorted.

- Functions for calculating the b-spline basis are now exported to R as internal functions of the package. They can be accessed using the
`package:::function`

notation.

`y`

must now be a matrix of either \(\text{T} \times 1\) or \(\text{T} \times \text{P}\).`trace`

specifies whether a progress bar will be printed or not. Default to`TRUE`

.`loss_function`

lets you now specify “quantile”, “expectile” or “percentage”. All functions are generalized as in Gneitling 2009. The power can be scaled by`loss_parameter`

. The latter defaults to 1, which leads to the well-known quantile, squared, and absolute percentage loss.`gradient`

lets you specify whether the learning algorithm should consider actual loss or a linearized version using the gradient of the loss. Defaults to`TRUE`

(gradient-based learning).`forget_performance`

was added. It defines the share of the past performance that will be ignored when selecting the best parameter combination.- Renamed
`forget`

parameter to`forget_regret`

to underline its reference to the regret. - New
`init_weights`

parameter. It has to be either a Kx1 or KxP matrix specifying the experts’ starting weights. - Add
`lead_time`

parameter. offset for expert forecasts. Defaults to 0 which means that experts predict t+1 at t. Setting this to h means experts’ predictions refer to t+1+h at time t. The weight updates delay accordingly.

- If more expert forecasts than observations are provided, the excessive expert forecasts are used for prediction using the most recent weights.
`tau`

is now optional. It defaults to 1:P/(P+1). A scalar given to tau will be repeated P times. The latter is useful in multivariate settings.- The pinball_loss and loss_pred functions were replaced by a more flexible function called
`loss`

. - The
`weights`

object is changed from a \((\text{T}+1 \times \text{K} \times \text{P})\) array to a \((\text{T}+1 \times \text{P} \times \text{K})\) array to match other objects’ dimensions. Now the following indexing scheme is consistent throughout the package: (Time, Probabilities, Experts, Parameter combination) - Fixed Bug that caused single quantile calculations to fail.
- Various internal changes to improve readability and performance.

- Initial release on GitHub