Configuration

MindCV can parse the yaml file of the model through the argparse library and PyYAML library to configure parameters. Let's use squeezenet_1.0 model as an example to explain how to configure the corresponding parameters.

Basic Environment

Parameter description
- mode: Use graph mode (0) or pynative mode (1).
- distribute: Whether to use distributed.
Sample yaml file
```
mode: 0
distribute: True
...
```

Parse parameter setting

python train.py --mode 0 --distribute False ...

Corresponding code example

args.mode represents the parameter mode, args.distribute represents the parameter distribute.

def train(args):
    ms.set_context(mode=args.mode)

    if args.distribute:
        init()
        device_num = get_group_size()
        rank_id = get_rank()
        ms.set_auto_parallel_context(device_num=device_num,
                                     parallel_mode='data_parallel',
                                     gradients_mean=True)
    else:
        device_num = None
        rank_id = None
    ...

Dataset

Parameter description
- dataset: dataset name.
- data_dir: Path of dataset file.
- shuffle: whether to shuffle the dataset.
- dataset_download: whether to download the dataset.
- batch_size: The number of rows in each batch.
- drop_remainder: Determines whether to drop the last block whose data row number is less than the batch size.
- num_parallel_workers: Number of workers(threads) to process the dataset in parallel.

Sample yaml file

dataset: 'imagenet'
data_dir: './imagenet2012'
shuffle: True
dataset_download: False
batch_size: 32
drop_remainder: True
num_parallel_workers: 8
...

Parse parameter setting

python train.py ... --dataset imagenet --data_dir ./imagenet2012 --shuffle True \
    --dataset_download False --batch_size 32 --drop_remainder True \
    --num_parallel_workers 8 ...

Corresponding code example

def train(args):
    ...
    dataset_train = create_dataset(
        name=args.dataset,
        root=args.data_dir,
        split='train',
        shuffle=args.shuffle,
        num_samples=args.num_samples,
        num_shards=device_num,
        shard_id=rank_id,
        num_parallel_workers=args.num_parallel_workers,
        download=args.dataset_download,
        num_aug_repeats=args.aug_repeats)

    ...
    target_transform = transforms.OneHot(num_classes) if args.loss == 'BCE' else None

    loader_train = create_loader(
        dataset=dataset_train,
        batch_size=args.batch_size,
        drop_remainder=args.drop_remainder,
        is_training=True,
        mixup=args.mixup,
        cutmix=args.cutmix,
        cutmix_prob=args.cutmix_prob,
        num_classes=args.num_classes,
        transform=transform_list,
        target_transform=target_transform,
        num_parallel_workers=args.num_parallel_workers,
    )
    ...

Data Augmentation

Parameter description
- image_resize: the image size after resizing for adapting to the network.
- scale: random resize scale.
- ratio: random resize aspect ratio.
- hfilp: horizontal flip training aug probability.
- interpolation: image interpolation mode for resize operator.
- crop_pct: input image center crop percent.
- color_jitter: color jitter factor.
- re_prob: the probability of performing erasing.

Sample yaml file

image_resize: 224
scale: [0.08, 1.0]
ratio: [0.75, 1.333]
hflip: 0.5
interpolation: 'bilinear'
crop_pct: 0.875
color_jitter: [0.4, 0.4, 0.4]
re_prob: 0.5
...

Parse parameter setting

python train.py ... --image_resize 224 --scale [0.08, 1.0] --ratio [0.75, 1.333] \
    --hflip 0.5 --interpolation "bilinear" --crop_pct 0.875 \
    --color_jitter [0.4, 0.4, 0.4] --re_prob 0.5 ...

Corresponding code example

def train(args):
    ...
    transform_list = create_transforms(
        dataset_name=args.dataset,
        is_training=True,
        image_resize=args.image_resize,
        scale=args.scale,
        ratio=args.ratio,
        hflip=args.hflip,
        vflip=args.vflip,
        color_jitter=args.color_jitter,
        interpolation=args.interpolation,
        auto_augment=args.auto_augment,
        mean=args.mean,
        std=args.std,
        re_prob=args.re_prob,
        re_scale=args.re_scale,
        re_ratio=args.re_ratio,
        re_value=args.re_value,
        re_max_attempts=args.re_max_attempts
    )
    ...

Model

Parameter description
- model: model name.
- num_classes: number of label classes.
- pretrained: whether load pretrained model.
- ckpt_path: initialize model from this checkpoint.
- keep_checkpoint_max: max number of checkpoint files.
- ckpt_save_dir: the path of checkpoint.
- epoch_size: train epoch size.
- dataset_sink_mode: the dataset sink mode.
- amp_level: auto mixed precision level for saving memory and acceleration.

Sample yaml file

model: 'squeezenet1_0'
num_classes: 1000
pretrained: False
ckpt_path: './squeezenet1_0_gpu.ckpt'
keep_checkpoint_max: 10
ckpt_save_dir: './ckpt/'
epoch_size: 200
dataset_sink_mode: True
amp_level: 'O0'
...

Parse parameter setting

python train.py ... --model squeezenet1_0 --num_classes 1000 --pretrained False \
    --ckpt_path ./squeezenet1_0_gpu.ckpt --keep_checkpoint_max 10 \
    --ckpt_save_path ./ckpt/ --epoch_size 200 --dataset_sink_mode True \
    --amp_level O0 ...

Corresponding code example

def train(args):
    ...
    network = create_model(model_name=args.model,
        num_classes=args.num_classes,
        in_channels=args.in_channels,
        drop_rate=args.drop_rate,
        drop_path_rate=args.drop_path_rate,
        pretrained=args.pretrained,
        checkpoint_path=args.ckpt_path,
        ema=args.ema
    )
    ...

Loss Function

Parameter description
- loss: name of loss function, BCE (BinaryCrossEntropy) or CE (CrossEntropy).
- label_smoothing: use label smoothing.
Sample yaml file
```
loss: 'CE'
label_smoothing: 0.1
...
```

Parse parameter setting

python train.py ... --loss CE --label_smoothing 0.1 ...

Corresponding code example

def train(args):
    ...
    loss = create_loss(name=args.loss,
        reduction=args.reduction,
        label_smoothing=args.label_smoothing,
        aux_factor=args.aux_factor
     )
    ...

Learning Rate Scheduler

Parameter description
- scheduler: name of scheduler.
- min_lr: the minimum value of learning rate if the scheduler supports.
- lr: learning rate.
- warmup_epochs: warmup epochs.
- decay_epochs: decay epochs.

Sample yaml file

scheduler: 'cosine_decay'
min_lr: 0.0
lr: 0.01
warmup_epochs: 0
decay_epochs: 200
...

Parse parameter setting

python train.py ... --scheduler cosine_decay --min_lr 0.0 --lr 0.01 \
    --warmup_epochs 0 --decay_epochs 200 ...

Corresponding code example

def train(args):
    ...
    lr_scheduler = create_scheduler(num_batches,
        scheduler=args.scheduler,
        lr=args.lr,
        min_lr=args.min_lr,
        warmup_epochs=args.warmup_epochs,
        warmup_factor=args.warmup_factor,
        decay_epochs=args.decay_epochs,
        decay_rate=args.decay_rate,
        milestones=args.multi_step_decay_milestones,
        num_epochs=args.epoch_size,
        lr_epoch_stair=args.lr_epoch_stair
    )
    ...

Optimizer

Parameter description
- opt: name of optimizer.
- weight_decay_filter: weight decay filter (filter parameters from weight decay).
- momentum: Hyperparameter of type float, means momentum for the moving average.
- weight_decay: weight decay (L2 penalty).
- loss_scale: gradient scaling factor
- use_nesterov: whether enables the Nesterov momentum

Sample yaml file

opt: 'momentum'
weight_decay_filter: 'norm_and_bias'
momentum: 0.9
weight_decay: 0.00007
loss_scale: 1024
use_nesterov: False
...

Parse parameter setting

python train.py ... --opt momentum --weight_decay_filter 'norm_and_bias' --weight_decay 0.00007 \
    --loss_scale 1024 --use_nesterov False ...

Corresponding code example

def train(args):
    ...
    if args.ema:
        optimizer = create_optimizer(network.trainable_params(),
            opt=args.opt,
            lr=lr_scheduler,
            weight_decay=args.weight_decay,
            momentum=args.momentum,
            nesterov=args.use_nesterov,
            weight_decay_filter=args.weight_decay_filter,
            loss_scale=args.loss_scale,
            checkpoint_path=opt_ckpt_path,
            eps=args.eps
        )
    else:
        optimizer = create_optimizer(network.trainable_params(),
            opt=args.opt,
            lr=lr_scheduler,
            weight_decay=args.weight_decay,
            momentum=args.momentum,
            nesterov=args.use_nesterov,
            weight_decay_filter=args.weight_decay_filter,
            checkpoint_path=opt_ckpt_path,
            eps=args.eps
        )
    ...

Combination of Yaml and Parse

You can override the parameter settings in the yaml file by using parse to set parameters. Take the following shell command as an example,

python train.py -c ./configs/squeezenet/squeezenet_1.0_gpu.yaml --data_dir ./data

The above command overwrites the value of args.data_dir parameter from ./imagenet2012 in yaml file to ./data.

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configuration.md

configuration.md

Configuration

Basic Environment

Dataset

Data Augmentation

Model

Loss Function

Learning Rate Scheduler

Optimizer

Combination of Yaml and Parse

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configuration.md

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configuration.md

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Configuration

Basic Environment

Dataset

Data Augmentation

Model

Loss Function

Learning Rate Scheduler

Optimizer

Combination of Yaml and Parse