TST Reduce dataset size in check_estimator_sparse_data (scikit-learn#21515)

Author: mohaseeb

sklearn/utils/estimator_checks.py

@@ -791,7 +791,7 @@ def _generate_sparse_matrix(X_csr):
 
 def check_estimator_sparse_data(name, estimator_orig):
     rng = np.random.RandomState(0)
-    X = rng.rand(40, 10)
+    X = rng.rand(40, 3)
     X[X < 0.8] = 0
     X = _pairwise_estimator_convert_X(X, estimator_orig)
     X_csr = sparse.csr_matrix(X)