Compat with older statsmodels

seaborn/distributions.py

@@ -373,6 +373,9 @@ def _statsmodels_univariate_kde(data, kernel, bw, gridsize, cut, clip,
     fft = kernel == "gau"
     kde = smnp.KDEUnivariate(data)
 
+    # statsmodels 0.8 fails on int type data
+    data = data.astype(np.float64)
+
     try:
         kde.fit(kernel, bw, fft, gridsize=gridsize, cut=cut, clip=clip)
     except RuntimeError as err:  # GH#1990
@@ -471,6 +474,10 @@ def _bivariate_kdeplot(x, y, filled, fill_lowest,
 
 def _statsmodels_bivariate_kde(x, y, bw, gridsize, cut, clip):
     """Compute a bivariate kde using statsmodels."""
+    # statsmodels 0.8 fails on int type data
+    x = x.astype(np.float64)
+    y = y.astype(np.float64)
+
     if isinstance(bw, str):
         bw_func = getattr(smnp.bandwidths, "bw_" + bw)
         x_bw = bw_func(x)