Sets the callback function for use during training

# fann_set_callback

(PECL fann >= 1.0.0)

fann_set_callback — Sets the callback function for use during training

### 説明

function fann_set_callback(resource `$ann`, callable `$callback`): bool

Sets the callback function for use during training. It means that it is called from fann_train_on_data() or fann_train_on_file().

### パラメータ

`ann`
  ニューラルネットワークリソース。
`callback`

  The supplied callback function takes following parameters:

  - `ann` - The neural network resource
  - `train` - The train data resource or `null` if called from fann_train_on_file()
  - `max_epochs` - The maximum number of epochs the training should continue
  - `epochs_between_reports` - The number of epochs between calling this function
  - `desired_error` - The desired fann_get_MSE() or fann_get_bit_fail(), depending on the stop function chosen by fann_set_train_stop_function()
  - `epochs` - The current epoch

  The callback should return `true`. If it returns `false`, the training will terminate.

### 戻り値

成功した場合に `true`、それ以外の場合に `false` を返します。

### 参考

- fann_train_on_data() - Trains on an entire dataset for a period of time
- fann_train_on_file() - Trains on an entire dataset, which is read from file, for a period of time

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