\name{predict_model}
\alias{predict_model}
\title{Predict from a Portable Model Specification}
\usage{predict_model(spec, rows)}
\arguments{
  \item{spec}{A validated model specification.}
  \item{rows}{A numeric matrix or data frame of input rows.}
}
\value{A numeric vector of predictions.}
\description{Predict from a portable mars model specification.}
