code: def bin_dense_train_data(bin_dense_train_data):
      bin_dense, bin_target = bin_dense_train_data
      bin_target = bin_target * 2 - 1
      return bin_dense, bin_target
  
imports: import numpy
  import pytest
  from scipy.linalg import svd, diagsvd
  from lightning.classification import FistaClassifier
  from lightning.regression import FistaRegressor
  from lightning.impl.penalty import project_simplex, L1Penalty
label_desc: Use image node_id 1 for calling a global function with example usage: bin_dense_train_data(bin_dense_train_data) and returns: bin_dense,  bin_target