ModelCheckpoint¶

class paddle.callbacks. ModelCheckpoint ( save_freq=1, save_dir=None ) [source]

Model checkpoint callback function to save model weights and optimizer state during training in conjunction with model.fit(). Currently, ModelCheckpoint only supports saving after a fixed number of epochs.

Parameters

• save_freq (int) – The frequency, in number of epochs, the model checkpoint are saved. Default: 1.

• save_dir (str|None) – The directory to save checkpoint during training. If None, will not save checkpoint. Default: None.

Examples

import paddle
import paddle.vision.transforms as T
from paddle.vision.datasets import MNIST
from paddle.static import InputSpec

inputs = [InputSpec([-1, 1, 28, 28], 'float32', 'image')]
labels = [InputSpec([None, 1], 'int64', 'label')]

transform = T.Compose([
    T.Transpose(),
    T.Normalize([127.5], [127.5])
])
train_dataset = MNIST(mode='train', transform=transform)

lenet = paddle.vision.models.LeNet()
model = paddle.Model(lenet,
    inputs, labels)

optim = paddle.optimizer.Adam(0.001, parameters=lenet.parameters())
model.prepare(optimizer=optim,
            loss=paddle.nn.CrossEntropyLoss(),
            metrics=paddle.metric.Accuracy())

callback = paddle.callbacks.ModelCheckpoint(save_dir='./temp')
model.fit(train_dataset, batch_size=64, callbacks=callback)

on_epoch_begin ( epoch=None, logs=None )

on_epoch_begin¶

Called at the beginning of each epoch.

Parameters

• epoch (int) – The index of epoch.

• logs (dict) – The logs is a dict or None. The logs passed by paddle.Model is None.

on_epoch_end ( epoch, logs=None )

on_epoch_end¶

Called at the end of each epoch.

Parameters

• epoch (int) – The index of epoch.

• logs (dict) – The logs is a dict or None. The logs passed by paddle.Model is a dict, contains ‘loss’, metrics and ‘batch_size’ of last batch.

on_train_end ( logs=None )

on_train_end¶

Called at the end of training.

Parameters

logs (dict) – The logs is a dict or None. The keys of logs passed by paddle.Model contains ‘loss’, metric names and batch_size.