Develop Guide: Components

Starting in ver 2.0, FATE components serve as entry points to modules for job scheduler. In general, computational logic should be contained within ML modules, while components call module functions with proper input and pass respective result data and model to scheduler.

Components CLI

Check available commands:

python -m fate.components component --help
Usage: python -m fate.components component [OPTIONS] COMMAND [ARGS]...

Options:
  --help  Show this message and exit.

Commands:
  artifact-type
  cleanup        cleanup
  desc           generate component_desc describe config
  execute        execute component
  list           list all components
  task-schema    generate component_desc task config json schema

List all components:

python -m fate.components component list  
{'buildin': ['feature_scale', 'reader', 'coordinated_lr', 'coordinated_linr', 'homo_nn', 'hetero_nn', 'homo_lr', 'hetero_secureboost', 'dataframe_transformer', 'psi', 'evaluation', 'artifact_test', 'statistics', 'hetero_feature_binning', 'hetero_feature_selection', 'feature_correlation', 'union', 'sample', 'data_split', 'sshe_lr', 'sshe_linr', 'toy_example', 'dataframe_io_test', 'multi_model_test', 'cv_test2'], 'thirdparty': []}

To make description file for a new component:

python -m fate.components component desc --name feature_scale --save feature_scale.yaml

If new component will be added to PipeLine, make sure to move the description file into folder $fate_client/python/fate_client/pipeline/component_define/fate and include a python file that defines new component in ${FATE-Client}/python/fate_client/pipeline/components.

New Component

A simple component example may be found here For more advanced case, please refer here

In general, follow the steps below to create a new component:

Create a new python file under $fate_base/python/fate/components/components. We recommend that file be named after new component.
Define the new component and add decorator @cpn.component(roles=[$role], provider="{$provider_source}") to component in the new python file. Include the component in loading list in components/components/__init__.py.
```
@cpn.component(roles=[GUEST, HOST], provider="fate")
def sshe_lr(ctx, role):
    ...
```

Implement component.

If new component supports different stages(train, predict, and maybe cross validation), mark respective stage implementation with corresponding decorators:

@sshe_lr.train()
def train():
   ...

@sshe_lr.predict()
def predict():
    ...

Specify inputs and outputs for each stage implementation.

@sshe_lr.train()
def train(
   ctx: Context,
   role: Role,
   train_data: cpn.dataframe_input(roles=[GUEST, HOST]),
   validate_data: cpn.dataframe_input(roles=[GUEST, HOST], optional=True),
   epochs: cpn.parameter(type=params.conint(gt=0), default=20, desc="max iteration num"),
   batch_size: cpn.parameter(
       type=params.conint(ge=10),
       default=None,
       desc="batch size, None means full batch, otherwise should be no less than 10, default None",
   ),
   tol: cpn.parameter(type=params.confloat(ge=0), default=1e-4),
   early_stop: cpn.parameter(
       type=params.string_choice(["weight_diff", "diff", "abs"]),
       default="diff",
       desc="early stopping criterion, choose from {weight_diff, diff, abs}, if use weight_diff,"
       "weight will be revealed every epoch",
   ),
   learning_rate: cpn.parameter(type=params.confloat(ge=0), default=0.05, desc="learning rate"),
   reveal_every_epoch: cpn.parameter(
       type=bool, default=False, desc="whether reveal encrypted result every epoch, " "only accept False for now"
   ),
   init_param: cpn.parameter(
       type=params.init_param(),
       default=params.InitParam(method="random_uniform", fit_intercept=True, random_state=None),
       desc="Model param init setting.",
   ),
   threshold: cpn.parameter(
       type=params.confloat(ge=0.0, le=1.0), default=0.5, desc="predict threshold for binary data"
   ),
   reveal_loss_freq: cpn.parameter(
       type=params.conint(ge=1),
       default=1,
       desc="rounds to reveal training loss, " "only effective if `early_stop` is 'loss'",
   ),
   train_output_data: cpn.dataframe_output(roles=[GUEST]),
   output_model: cpn.json_model_output(roles=[GUEST, HOST]),
   warm_start_model: cpn.json_model_input(roles=[GUEST, HOST], optional=True)):
    train_ctx = ctx.sub_ctx("train")
   
@sshe_lr.predict()
def predict(
    ctx,
    role: Role,
    # threshold: cpn.parameter(type=params.confloat(ge=0.0, le=1.0), default=0.5),
    test_data: cpn.dataframe_input(roles=[GUEST, HOST]),
    input_model: cpn.json_model_input(roles=[GUEST, HOST]),
    test_output_data: cpn.dataframe_output(roles=[GUEST]),
):
    predict_ctx = ctx.sub_ctx("predict")

@sshe_lr.cross_validation()
def cross_validation(
    ctx: Context,
   role: Role,
   cv_data: cpn.dataframe_input(roles=[GUEST, HOST]),
   epochs: cpn.parameter(type=params.conint(gt=0), default=20, desc="max iteration num"),
   batch_size: cpn.parameter(
       type=params.conint(ge=10),
       default=None,
       desc="batch size, None means full batch, otherwise should be no less than 10, default None",
   ),
   tol: cpn.parameter(type=params.confloat(ge=0), default=1e-4),
   early_stop: cpn.parameter(
       type=params.string_choice(["weight_diff", "diff", "abs"]),
       default="diff",
       desc="early stopping criterion, choose from {weight_diff, diff, abs}, if use weight_diff,"
       "weight will be revealed every epoch",
   ),
   learning_rate: cpn.parameter(type=params.confloat(ge=0), default=0.05, desc="learning rate"),
   init_param: cpn.parameter(
       type=params.init_param(),
       default=params.InitParam(method="random_uniform", fit_intercept=True, random_state=None),
       desc="Model param init setting.",
   ),
   threshold: cpn.parameter(
       type=params.confloat(ge=0.0, le=1.0), default=0.5, desc="predict threshold for binary data"
   ),
   reveal_every_epoch: cpn.parameter(
       type=bool, default=False, desc="whether reveal encrypted result every epoch, " "only accept False for now"
   ),
   reveal_loss_freq: cpn.parameter(
       type=params.conint(ge=1),
       default=1,
       desc="rounds to reveal training loss, " "only effective if `early_stop` is 'loss'",
   ),
   cv_param: cpn.parameter(
       type=params.cv_param(),
       default=params.CVParam(n_splits=5, shuffle=False, random_state=None),
       desc="cross validation param",
   ),
   metrics: cpn.parameter(type=params.metrics_param(), default=["auc"]),
   output_cv_data: cpn.parameter(type=bool, default=True, desc="whether output prediction result per cv fold"),
   cv_output_datas: cpn.dataframe_outputs(roles=[GUEST, HOST], optional=True),
):
    cv_ctx = ctx.sub_ctx("cross_validation")

In the case where no differentiation between stages is needed, or that the component will always be executed with default stage, parameters may be directly defined in the component entry function:

@cpn.component(roles=[GUEST, HOST], provider="fate")
def data_split(
    ctx: Context,
    role: Role,
    input_data: cpn.dataframe_input(roles=[GUEST, HOST]),
    train_size: cpn.parameter(
        type=Union[params.confloat(ge=0.0, le=1.0), params.conint(ge=0)],
        default=None,
        desc="size of output training data, " "should be either int for exact sample size or float for fraction",
    ),
    validate_size: cpn.parameter(
        type=Union[params.confloat(ge=0.0, le=1.0), params.conint(ge=0)],
        default=None,
        desc="size of output validation data, " "should be either int for exact sample size or float for fraction",
    ),
    test_size: cpn.parameter(
        type=Union[params.confloat(ge=0.0, le=1.0), params.conint(ge=0)],
        default=None,
        desc="size of output test data, " "should be either int for exact sample size or float for fraction",
    ),
    stratified: cpn.parameter(
        type=bool,
        default=False,
        desc="whether sample with stratification, " "should not use this for data with continuous label values",
    ),
    random_state: cpn.parameter(type=params.conint(ge=0), default=None, desc="random state"),
    hetero_sync: cpn.parameter(
        type=bool,
        default=True,
        desc="whether guest sync data set sids with host, "
        "default True for hetero scenario, "
        "should set to False for local and homo scenario",
    ),
    train_output_data: cpn.dataframe_output(roles=[GUEST, HOST], optional=True),
    validate_output_data: cpn.dataframe_output(roles=[GUEST, HOST], optional=True),
    test_output_data: cpn.dataframe_output(roles=[GUEST, HOST], optional=True),
):
    ...

Always include context and role in input list.

context provides background and common tools for running modules, including recall and ports to send and receive data across parties.
- For different stages, make sure to name and provide separate sub-context
role corresponds to local party identity, useful when different roles execute distinct modular functions.

In addition, components may have the following common types of inputs:
dataframe: as dataframe_input, access data content by read()api
```
train_data_frame = train_data.read()
columns = train_data_frame.schema.columns()
```
- train_data: for train stage
- test_data: for predict stage
- cv_data: for cross validation
- input_data: for default stage
model: as json_model_input, access model dict by read api
```
model = input_model.read()
```
- input_model: for predict stage
- warm_start_model: for warm start
parameter: as cpn_parameter
- arbitrary values, should include type, default value, and short description
For outputs, components may have these types:
dataframe: as dataframe_output
- train_output_data: for train stage
- predict_output_data: for predict stage, or for DataSplit module
- validate_output_data: for DataSplit module only
- output_cv_data: for cross validation, usually optional
model: as json_model_output
- train_output_model: for train stage
Substantiate output objects through write api:
```
model_dict = module.get_model()
train_output_model.write(model_dict)

data = module.transform(train_data)
train_output_data.write(data)
```
All inputs and outputs may be set as optional.

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