diff --git a/_unittests/ut_mlmodel/test_tsne_predictable.py b/_unittests/ut_mlmodel/test_tsne_predictable.py
index 4e10bb1d..39692b0c 100644
--- a/_unittests/ut_mlmodel/test_tsne_predictable.py
+++ b/_unittests/ut_mlmodel/test_tsne_predictable.py
@@ -6,17 +6,20 @@
 import numpy
 from numpy.random import RandomState
 from sklearn import datasets
+from sklearn.exceptions import ConvergenceWarning
 from sklearn.preprocessing import StandardScaler
 from sklearn.neighbors import KNeighborsRegressor
 from sklearn.neural_network import MLPRegressor
 from sklearn.manifold import TSNE
-from pyquickhelper.pycode import ExtTestCase, skipif_circleci
+from pyquickhelper.pycode import (
+    ExtTestCase, skipif_circleci, ignore_warnings)
 from mlinsights.mlmodel import PredictableTSNE
 from mlinsights.mlmodel import test_sklearn_pickle, test_sklearn_clone
 
 
 class TestPredictableTSNE(ExtTestCase):
 
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne(self):
         iris = datasets.load_iris()
         X, y = iris.data[:20], iris.target[:20]
@@ -28,6 +31,7 @@ def test_predictable_tsne(self):
         self.assertNotEmpty(pred)
 
     @skipif_circleci('stuck')
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne_knn(self):
         iris = datasets.load_iris()
         X, y = iris.data[:20], iris.target[:20]
@@ -39,6 +43,7 @@ def test_predictable_tsne_knn(self):
         self.assertIsInstance(clr.estimator_, KNeighborsRegressor)
         self.assertEqual(pred.shape, (X.shape[0], 2))
 
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne_intercept_weights(self):
         iris = datasets.load_iris()
         X, y = iris.data[:20], iris.target[:20]
@@ -48,15 +53,18 @@ def test_predictable_tsne_intercept_weights(self):
         self.assertGreater(clr.loss_, 0)
         self.assertEqual(acc.shape, (X.shape[0], 2))
 
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne_pickle(self):
         iris = datasets.load_iris()
         X, y = iris.data[:20], iris.target[:20]
         test_sklearn_pickle(lambda: PredictableTSNE(), X, y)
 
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne_clone(self):
         self.maxDiff = None
         test_sklearn_clone(lambda: PredictableTSNE())
 
+    @ignore_warnings(ConvergenceWarning)
     def test_predictable_tsne_relevance(self):
         state = RandomState(seed=0)
         Xs = []
diff --git a/mlinsights/mlbatch/pipeline_cache.py b/mlinsights/mlbatch/pipeline_cache.py
index c7622f6f..6025993e 100644
--- a/mlinsights/mlbatch/pipeline_cache.py
+++ b/mlinsights/mlbatch/pipeline_cache.py
@@ -2,7 +2,7 @@
 @file
 @brief Caches training.
 """
-from distutils.version import StrictVersion
+from distutils.version import StrictVersion  # pylint: disable=W0402
 from sklearn import __version__ as skl_version
 from sklearn.base import clone
 from sklearn.pipeline import Pipeline, _fit_transform_one
diff --git a/mlinsights/mlmodel/predictable_tsne.py b/mlinsights/mlmodel/predictable_tsne.py
index 715bf5d9..75690573 100644
--- a/mlinsights/mlmodel/predictable_tsne.py
+++ b/mlinsights/mlmodel/predictable_tsne.py
@@ -20,23 +20,19 @@ class PredictableTSNE(BaseEstimator, TransformerMixin):
     which approximates the outputs of a :epkg:`TSNE` transformer.
     Notebooks :ref:`predictabletsnerst` gives an example on how to
     use this class.
+
+    :param normalizer: None by default
+    :param transformer: :epkg:`sklearn:manifold:TSNE` by default
+    :param estimator: :epkg:`sklearn:neural_network:MLPRegressor` by default
+    :param normalize: normalizes the outputs, centers and normalizes
+        the output of the *t-SNE* and applies that same
+        normalization to he prediction of the estimator
+    :param keep_tsne_output: if True, keep raw outputs of
+        :epkg:`TSNE` is stored in member `tsne_outputs_`
     """
 
     def __init__(self, normalizer=None, transformer=None, estimator=None,
                  normalize=True, keep_tsne_outputs=False):
-        """
-        @param      normalizer          None by default
-        @param      transformer         :epkg:`sklearn:manifold:TSNE`
-                                        by default
-        @param      estimator           :epkg:`sklearn:neural_network:MLPRegressor`
-                                        by default
-        @param      normalize           normalizes the outputs, centers and normalizes
-                                        the output of the *t-SNE* and applies that same
-                                        normalization to he prediction of the estimator
-        @param      keep_tsne_output    if True, keep raw outputs of
-                                        :epkg:`TSNE` is stored in member
-                                        *tsne_outputs_*
-        """
         TransformerMixin.__init__(self)
         BaseEstimator.__init__(self)
         if estimator is None:
@@ -98,6 +94,9 @@ def fit(self, X, y, sample_weight=None):
             self.normalizer_ = None
 
         self.transformer_ = clone(self.transformer)
+        if (hasattr(self.transformer_, 'perplexity') and
+                self.transformer_.perplexity >= X.shape[0]):
+            self.transformer_.perplexity = X.shape[0] - 1
 
         sig = inspect.signature(self.transformer.fit_transform)
         pars = {}
diff --git a/mlinsights/plotting/visualize.py b/mlinsights/plotting/visualize.py
index 582232dd..a211a161 100644
--- a/mlinsights/plotting/visualize.py
+++ b/mlinsights/plotting/visualize.py
@@ -219,8 +219,7 @@ def pipeline2dot(pipe, data, **params):
     elif isinstance(raw_data, numpy.ndarray):
         if len(raw_data.shape) != 2:
             raise NotImplementedError(  # pragma: no cover
-                f"Unexpected training data dimension: {data.shape}."
-                f"")  # pylint: disable=E1101
+                f"Unexpected training data dimension {raw_data.shape}.")
         for i in range(raw_data.shape[1]):
             data['X%d' % i] = 'sch0:f%d' % i
     elif not isinstance(raw_data, list):