Ejemplo n.º 1
0
def test_NaiveGraphNet_classification( n, p, num_obs_class1 = 100, num_obs_class2 = 100 ):
    """
    Test the naive graphnet on a binary classification problem
    """
    # classification data
    class_data = classification_dataset( n, p, num_obs_class1, num_obs_class2, SNR = 1, corr1 = 0.9, corr2 = None )
    X = class_data[1]
    y = class_data[0]
    
    #Prepare adjacency matrix from "mask" of X (usually we'd get it from a mask file, see mask.py)
    Adj = prepare_adj(1+0.*X,0,1,1,0)
    1/0
    l1 = 50.
    l2 = 5.
    l3 = 30.
    delta = 100.

    #Run optimization
    l = cwpath.CoordWise((X, y, Adj), graphnet.GraphNet ) #, initial_coefs=np.random.normal(0,1,81))
    l.problem.assign_penalty(l1=l1,l2=l2,l3=l3)#,delta=delta)
    l.fit()

    beta =np.round(1000*l.problem.coefficients)/1000
    print beta
Ejemplo n.º 2
0
n = 25
#Generate toy data: 3x3x3x3 data on n trials
X_orig = np.random.normal(0,1,n*3**4).reshape((n,3,3,3,3))

#Reshape X to 2 dimensions
p = np.prod(X_orig.shape[1:])
X = np.zeros((n,p))
for i in range(n):
    X[i,:] = X_orig[i].reshape((1,p))

    beta = np.append(5*np.ones(10),np.zeros(71))
    Y = np.dot(X,beta)

    #Prepare adjacency matrix from "mask" of X (usually we'd get it from a mask file, see mask.py)
    Adj = prepare_adj(1+0.*X_orig[0],0,1,1,1)

    l1 = 50.
    l2 = 5.
    l3 = 30.
    delta = 100.

    #Run optimization
    l = cwpath.CoordWise((X, Y, Adj), graphnet.GraphNet, initial_coefs=np.random.normal(0,1,81))
    l.problem.assign_penalty(l1=l1,l2=l2,l3=l3)#,delta=delta)
    l.fit()

    beta =np.round(1000*l.problem.coefficients)/1000
    print beta

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