The cyanotype process, which gave birth to the "blueprint", uses iron salts and UV light to transform simple negatives into deep Prussian blue artwork.

Features

Cyantic lets you build complex types from simple blueprints, using Pydantic.

• Using intermediate Pydantic models as Blueprints, giving type safety and validation for parameters.
• Reference other values using @value:x.y.z.
• Import objects using @import:x.y.z.
• Inject environment variables using @env:MY_VAR.
• ...and define custom @hook handlers using a simple API.

Installation

• uv add cyantic

Usage

from cyantic import Blueprint, blueprint, CyanticModel, hook
from torch import Tensor
import torch
import yaml

# 1. Create and register some useful parameterisations
#       (or soon install from PyPi, i.e. `rye add cyantic-torch`)

@blueprint(Tensor)
class NormalTensor(Blueprint[Tensor]):

    mean: float
    std: float
    size: tuple[int, ...]

    def build(self) -> Tensor:
        return torch.normal(self.mean, self.std, size=self.size)

@blueprint(Tensor)
class UniformTensor(Blueprint[Tensor]):
    low: float
    high: float
    size: tuple[int, ...]

    def build(self) -> Tensor:
      return torch.empty(self.size).uniform_(self.low, self.high)


# 2. Write pydantic models using `CyanticModel` base class

class MyModel(CyanticModel):
    normal_tensor: Tensor
    uniform_tensor: Tensor


# 3. (optional) define custom hooks

@hook("env")
def env_hook(name: str, _: ValidationContext) -> str:
    """Handle @env:VARIABLE_NAME references."""
    try:
        return os.environ[name]
    except KeyError as e:
        raise ValueError(f"Environment variable {name} not found") from e


# 4. Validate from YAML files that specify the parameterisation

some_yaml = """common:
    size: [3, 5]
    foo: @env:MY_VARIABLE
normal_tensor:
    mean: 0.0
    std: 0.1
    size: @value:common.size
uniform_tensor:
    low: -1.0
    std: 1.0
    size: @value:common.size
"""

# 5. Receive objects built from the parameterisations.

my_model = MyModel.model_validate(yaml.safe_load(some_yaml))
assert isinstance(my_model.normal_tensor, Tensor)
assert isinstance(my_model.uniform_tensor, Tensor)

Development

• git clone https://github.com/flywhl/cyantic.git
• cd cyantic
• uv sync
• just test

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