add random_state

Author: rflamary

ot/datasets.py

@@ -36,7 +36,7 @@ def get_1D_gauss(n, m, s):
     return h / h.sum()
 
 
-def get_2D_samples_gauss(n, m, sigma):
+def get_2D_samples_gauss(n, m, sigma, random_state=None):
     """return n samples drawn from 2D gaussian N(m,sigma)
 
     Parameters
@@ -48,25 +48,31 @@ def get_2D_samples_gauss(n, m, sigma):
         mean value of the gaussian distribution
     sigma : np.array (2,2)
         covariance matrix of the gaussian distribution
-
+    random_state : int, RandomState instance or None, optional (default=None)
+        If int, random_state is the seed used by the random number generator;
+        If RandomState instance, random_state is the random number generator;
+        If None, the random number generator is the RandomState instance used
+        by `np.random`.
 
     Returns
     -------
     X : np.array (n,2)
           n samples drawn from  N(m,sigma)
 
     """
+    
+    generator = check_random_state(random_state)
     if np.isscalar(sigma):
         sigma = np.array([sigma, ])
     if len(sigma) > 1:
         P = sp.linalg.sqrtm(sigma)
-        res = np.random.randn(n, 2).dot(P) + m
+        res = generator.randn(n, 2).dot(P) + m
     else:
-        res = np.random.randn(n, 2) * np.sqrt(sigma) + m
+        res = generator.randn(n, 2) * np.sqrt(sigma) + m
     return res
 
 
-def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
+def get_data_classif(dataset, n, nz=.5, theta=0, random_state=None, **kwargs):
     """ dataset generation for classification problems
 
     Parameters
@@ -78,7 +84,11 @@ def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
         number of training samples
     nz : float
         noise level (>0)
-
+    random_state : int, RandomState instance or None, optional (default=None)
+        If int, random_state is the seed used by the random number generator;
+        If RandomState instance, random_state is the random number generator;
+        If None, the random number generator is the RandomState instance used
+        by `np.random`.
 
     Returns
     -------
@@ -88,6 +98,9 @@ def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
           labels of the samples
 
     """
+    
+    generator = check_random_state(random_state)
+    
     if dataset.lower() == '3gauss':
         y = np.floor((np.arange(n) * 1.0 / n * 3)) + 1
         x = np.zeros((n, 2))
@@ -99,8 +112,8 @@ def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
         x[y == 3, 0] = 1.
         x[y == 3, 1] = 0
 
-        x[y != 3, :] += 1.5 * nz * np.random.randn(sum(y != 3), 2)
-        x[y == 3, :] += 2 * nz * np.random.randn(sum(y == 3), 2)
+        x[y != 3, :] += 1.5 * nz * generator.randn(sum(y != 3), 2)
+        x[y == 3, :] += 2 * nz * generator.randn(sum(y == 3), 2)
 
     elif dataset.lower() == '3gauss2':
         y = np.floor((np.arange(n) * 1.0 / n * 3)) + 1
@@ -114,8 +127,8 @@ def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
         x[y == 3, 0] = 2.
         x[y == 3, 1] = 0
 
-        x[y != 3, :] += nz * np.random.randn(sum(y != 3), 2)
-        x[y == 3, :] += 2 * nz * np.random.randn(sum(y == 3), 2)
+        x[y != 3, :] += nz * generator.randn(sum(y != 3), 2)
+        x[y == 3, :] += 2 * nz * generator.randn(sum(y == 3), 2)
 
     elif dataset.lower() == 'gaussrot':
         rot = np.array(
@@ -127,8 +140,8 @@ def get_data_classif(dataset, n, nz=.5, theta=0, **kwargs):
         n2 = np.sum(y == 2)
         x = np.zeros((n, 2))
 
-        x[y == 1, :] = get_2D_samples_gauss(n1, m1, nz)
-        x[y == 2, :] = get_2D_samples_gauss(n2, m2, nz)
+        x[y == 1, :] = get_2D_samples_gauss(n1, m1, nz,random_state=generator)
+        x[y == 2, :] = get_2D_samples_gauss(n2, m2, nz,random_state=generator)
 
         x = x.dot(rot)