A set of utilities to create and manage typed configuration files effectively, built on top of OmegaConf.
Project description
Springs
A set of utilities to turn OmegaConf into a fully fledge configuration utils. Just like the springs inside an Omega watch, the Springs library helps you move on with your experiments.
Springs overlaps in functionality with Hydra, but without all the unnecessary boilerplate.
The current logo for Springs was generated using DALL·E 2.
To install Springs from PyPI, simply run:
pip install springs
Table of Contents:
- Philosophy
- A Note About Unstructured Configs
- Initializing Objects from Configurations
- Static and Dynamic Type Checking
- Flexible Configurations
- Adding Help Messages to Configurations
- Command Line Options
- Tips and Tricks
Philosophy
OmegaConf supports creating configurations in all sorts of manners, but we believe that there are benefits into defining configuration from structured objects, namely dataclass. Springs is built around that notion: write one or more dataclass to compose a configuration (with appropriate defaults), then parse the remainder of options or missing values from command line/a yaml file.
Let's look at an example. Imagine we are building a configuration for a machine learning (ML) experiment, and we want to provide information about model and data to use. We start by writing the following structure configuration
import springs as sp
from dataclasses import dataclass
# Data config
# sp.dataclass is an alias for
# dataclasses.dataclass
@sp.dataclass
class DataConfig:
# sp.MISSING is an alias to
# omegaconf.MISSING
path: str = sp.MISSING
split: str = 'train'
# Model config
@sp.dataclass
class ModelConfig:
name: str = sp.MISSING
num_labels: int = 2
# Experiment config
@sp.dataclass
class ExperimentConfig:
batch_size: int = 16
seed: int = 42
# Overall config
# for our program
@sp.dataclass
class Config:
data: DataConfig = DataConfig()
model: ModelConfig = ModelConfig()
exp: ExperimentConfig = ExperimentConfig()
Note how, in matching with OmegaConf syntax, we use MISSING
to indicate any value that has no default and should be provided at runtime.
If we want to use this configuration with a function that actually runs this experiment, we can use sp.cli
as follows:
@sp.cli(Config)
def main(config: Config)
# this will print the configuration
# like a dict
print(config)
# you can use dot notation to
# access attributes...
config.exp.seed
# ...or treat it like a dictionary!
config['exp']['seed']
if __name__ == '__main__':
main()
Notice how, in the configuration Config
above, some parameters are missing.
We can specify them from command line...
python main.py \
data.path=/path/to/data \
model.name=bert-base-uncased
...or from one or more YAML config files (if multiple, e.g., -c /path/to/cfg1.yaml -c /path/to/cfg2.yaml
the latter ones override the former ones).
data:
path: /path/to/data
model:
name: bert-base-uncased
# you can override any part of
# the config via YAML or CLI
# CLI takes precedence over YAML.
exp:
seed: 1337
To run with from YAML, do:
python main.py -c config.yaml
Easy, right?
A Note About Unstructured Configs
You are not required to used a structured config with Springs. To use our CLI with a bunch of yaml files and/or command line arguments, simply decorate your main function with no arguments.
@sp.cli()
def main(config)
# do stuff
...
Initializing Objects from Configurations
Sometimes a configuration contains all the necessary information to instantiate an object from it.
Springs supports this use case, and it is as easy as providing a _target_
node in a configuration:
@sp.dataclass
class ModelConfig:
_target_: str = (
'transformers.'
'AutoModelForSequenceClassification.'
'from_pretrained'
)
pretrained_model_name_or_path: str = \
'bert-base-uncased'
num_classes: int = 2
In your experiment code, run:
def run_model(model_config: ModelConfig):
...
model = sp.init.now(
model_config, ModelConfig
)
Note: While previous versions of Springs merely supported specifying the return type, now it is actively and strongly encouraged.
Running sp.init.now(model_config)
will raise a warning if the type is not provided. To prevent this warning, use sp.toggle_warnings(False)
before calling sp.init.now
/ sp.init.later
.
init.now
vs init.later
init.now
is used to immediately initialize a class or run a method.
But what if the function you are not ready to run the _target_
you want to initialize?
This is common for example if you receive a configuration in the init method of a class, but you don't have all parameters to run it until later in the object lifetime. In that case, you might want to use init.later
.
Example:
config = sp.from_dict({'_target_': 'str.lower'})
fn = sp.init.later(config, Callable[..., str])
... # much computation occurs
# returns `this to lowercase`
fn('THIS TO LOWERCASE')
Note that, for convenience sp.init.now
is aliased to sp.init
.
Providing Class Paths as _target_
If, for some reason, cannot specify the path to a class as a string, you can use sp.Target.to_string
to resolve a function, class, or method to its path:
import transformers
@sp.dataclass
class ModelConfig:
_target_: str = sp.Target.to_string(
transformers.
AutoModelForSequenceClassification.
from_pretrained
)
pretrained_model_name_or_path: str = \
'bert-base-uncased'
num_classes: int = 2
Static and Dynamic Type Checking
Springs supports both static and dynamic (at runtime) type checking when initializing objects. To enable it, pass the expected return type when initializing an object:
@sp.cli(TokenizerConfig)
def main(config: TokenizerConfig):
tokenizer = sp.init(
config, PreTrainedTokenizerBase
)
print(tokenizer)
This will raise an error when the tokenizer is not a subclass of PreTrainedTokenizerBase
. Further, if you use a static type checker in your workflow (e.g., Pylance in Visual Studio Code), springs.init
will also annotate its return type accordingly.
Flexible Configurations
Sometimes a configuration has some default parameters, but others are optional and depend on other factors, such as the _target_
class. In these cases, it is convenient to set up a flexible dataclass, using make_flexy
after the dataclass
decorator.
@sp.flexyclass
class MetricConfig:
_target_: str = sp.MISSING
average: str = 'macro'
config = sp.from_dataclass(MetricConfig)
overrides = {
# we override the _target_
'_target_': 'torchmetrics.F1Score',
# this attribute does not exist in the
# structured config
'num_classes': 2
}
config = sp.merge(config,
sp.from_dict(overrides))
print(config)
# this will print the following:
# {
# '_target_': 'torchmetrics.F1Score',
# 'average': 'macro',
# 'num_classes': 2
# }
Adding Help Messages to Configurations
Springs supports adding help messages to your configurations; this is useful to provide a description of parameters to users of your application.
To add a help for a parameter, simply pass help=...
to a field constructor:
@sp.dataclass
class ModelConfig:
_target_: str = sp.field(
default='transformers.'\
'AutoModelForSequenceClassification.'\
'from_pretrained',
help='The class for the model'
)
pretrained_model_name_or_path: str = sp.field(
default='bert-base-uncased',
help='The name of the model to use'
)
num_classes: int = sp.field(
default=2,
help='The number of classes for classification'
)
@sp.dataclass
class ExperimentConfig:
model: ModelConfig = sp.field(
default_factory=ModelConfig,
help='The model configuration'
)
@sp.cli(ExperimentConfig)
def main(config: ExperimentConfig):
...
if __name__ == '__main__':
main()
As you can see, you can also add help messages to nested configurations. Help messages are printed when you call python my_script.py --options
or python my_script.py --o
.
Command Line Options
You can print all command line options by calling python my_script.py -h
or python my_script.py --help
. Currently, a Springs application supports the following:
Flag | Default | Action | Description |
---|---|---|---|
-h/--help |
False |
toggle | show the help message and exit |
-c/--config |
[] |
append | either a path to a YAML file containing a configuration, or a nickname for a configuration in the registry; multiple configurations can be specified with additional -c/--config flags, and they will be merged in the order they are provided |
-o/--options |
False |
toggle | print all default options and CLI flags |
-i/--inputs |
False |
toggle | print the input configuration |
-p/--parsed |
False |
toggle | print the parsed configuration |
-l/--log-level |
WARNING |
set | logging level to use for this program; can be one of CRITICAL , ERROR , WARNING , INFO , or DEBUG ; defaults to WARNING . |
-d/--debug |
False |
toggle | enable debug mode; equivalent to --log-level DEBUG |
-q/--quiet |
False |
toggle | if provided, it does not print the configuration when running |
-r/--resolvers |
False |
toggle | print all registered resolvers in OmegaConf, Springs, and current codebase |
-n/--nicknames |
False |
toggle | print all registered nicknames in Springs |
-s/--save |
None |
set | save the configuration to a YAML file and exit |
Tips and Tricks
This section includes a bunch of tips and tricks for working with OmegaConf and YAML.
Tip 1: Repeating nodes in YAML input
In setting up YAML configuration files for ML experiments, it is common to have almost-repeated sections. In these cases, you can take advantage of YAML's built in variable mechanism and dictionary merging to remove duplicated imports:
# &tc assigns an alias to this node
train_config: &tc
path: /path/to/data
src_field: full_text
tgt_field: summary
split_name: train
test_config:
# << operator indicates merging,
# *tc is a reference to the alias above
<< : *tc
split_name: test
This will resolve to:
train_config:
path: /path/to/data
split_name: train
src_field: full_text
tgt_field: summary
test_config:
path: /path/to/data
split_name: test
src_field: full_text
tgt_field: summary
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