encoders

type FrequencyEncoder struct {
	// Columns to encode
	Columns []string

	// Normalize converts counts to frequencies (0-1 range). Default: false
	Normalize bool
	// contains filtered or unexported fields
}

type LabelEncoder struct {
	// Column to encode
	Column string
	// contains filtered or unexported fields
}

type OneHotEncoder struct {
	// Columns to encode
	Columns []string

	// DropFirst drops the first category to avoid multicollinearity (dummy variable trap).
	// Default: false
	DropFirst bool

	// HandleUnknown specifies how to handle unknown categories during transform.
	// Options: "error" (default), "ignore"
	HandleUnknown string
	// contains filtered or unexported fields
}

type OrdinalEncoder struct {
	// Column to encode
	Column string

	// Categories in order (e.g., ["low", "medium", "high"])
	Categories []string
	// contains filtered or unexported fields
}

type TargetEncoder struct {
	// Columns to encode
	Columns []string

	// Target column name (provided during Fit)
	Target string

	// Smooth is the smoothing factor. Higher values give more weight to global mean.
	// Default: 1.0
	Smooth float64
	// contains filtered or unexported fields
}