predict <- function (theta, X){
  
  #   Predict whether the label is 0 or 1 using learned logistic 
  #   regression parameters theta
  
  #   p <- predict(theta, X) computes the predictions for X using a 
  #   threshold at 0.5 (i.e., if sigmoid(theta'*x) >= 0.5, predict 1)
  
  # ====================== YOUR CODE HERE ======================
  # Instructions: Complete the following code to make predictions using
  #               your learned logistic regression parameters. 
  #               You should set p to a vector of 0's and 1's
  #
  
  
  
  # =============================================================
  
  return(p)
}