public static Transformer <TIn, TOut, TTrans> AssertStatic <[IsShape] TIn, [IsShape] TOut, TTrans>(
this TTrans transformer, IHostEnvironment env,
Func <SchemaAssertionContext, TIn> inputDecl,
Func <SchemaAssertionContext, TOut> outputDecl)
where TTrans : class, ITransformer
{
Contracts.CheckValue(env, nameof(env));
env.CheckValue(transformer, nameof(transformer));
env.CheckValue(inputDecl, nameof(inputDecl));
env.CheckValue(outputDecl, nameof(outputDecl));
var inSchema = StaticSchemaShape.Make <TIn>(inputDecl.Method.ReturnParameter);
var outSchema = StaticSchemaShape.Make <TOut>(outputDecl.Method.ReturnParameter);
return(new Transformer <TIn, TOut, TTrans>(env, transformer, inSchema, outSchema));
}
internal Estimator(IHostEnvironment env, IEstimator <TTransformer> estimator, StaticSchemaShape inShape, StaticSchemaShape outShape)
: base(env, outShape)
{
Env.CheckValue(estimator, nameof(estimator));
AsDynamic = estimator;
_inShape = inShape;
// Our ability to check estimators at constructor time is somewaht limited. During fit though we could.
// Fortunately, estimators are one of the least likely things that users will freqeuently declare the
// types of on their own.
}
internal Transformer(IHostEnvironment env, TTransformer transformer, StaticSchemaShape inShape, StaticSchemaShape outShape)
: base(env, outShape)
{
Env.AssertValue(transformer);
Env.AssertValue(inShape);
AsDynamic = transformer;
_inShape = inShape;
// The ability to check at runtime is limited. We could check during transformation time on the input data view.
}
internal DataReaderEstimator(IHostEnvironment env, IDataReaderEstimator <TIn, TDataReader> estimator, StaticSchemaShape shape)
: base(env, shape)
{
Env.AssertValue(estimator);
AsDynamic = estimator;
Shape.Check(Env, AsDynamic.GetOutputSchema());
}