Code review: Do not print warnings on import gudhi

1 files changed, 14 insertions, 18 deletions

diff --git a/src/python/gudhi/persistence_graphical_tools.py b/src/python/gudhi/persistence_graphical_tools.py
index cce091d5..c9c85e46 100644
--- a/src/python/gudhi/persistence_graphical_tools.py
+++ b/src/python/gudhi/persistence_graphical_tools.py
@@ -11,7 +11,6 @@
 from os import path
 from math import isfinite
 import numpy as np
-from functools import lru_cache
 
 from gudhi.reader_utils import read_persistence_intervals_in_dimension
 from gudhi.reader_utils import read_persistence_intervals_grouped_by_dimension
@@ -20,20 +19,7 @@ __author__ = "Vincent Rouvreau, Bertrand Michel, Theo Lacombe"
 __copyright__ = "Copyright (C) 2016 Inria"
 __license__ = "MIT"
 
-@lru_cache(maxsize=1)
-def _matplotlib_can_use_tex():
-    """This function returns True if matplotlib can deal with LaTeX, False otherwise.
-    The returned value is cached.
-    """
-    try:
-        from matplotlib import checkdep_usetex
-        return checkdep_usetex(True)
-    except ImportError:
-        print("This function is not available, you may be missing matplotlib.")
-
-
-_gudhi_matplotlib_use_tex = _matplotlib_can_use_tex()
-
+_gudhi_matplotlib_use_tex = True
 
 def __min_birth_max_death(persistence, band=0.0):
     """This function returns (min_birth, max_death) from the persistence.
@@ -71,6 +57,16 @@ def _array_handler(a):
     else:
         return a
 
+def _matplotlib_can_use_tex():
+    """This function returns True if matplotlib can deal with LaTeX, False otherwise.
+    The returned value is cached.
+    """
+    try:
+        from matplotlib import checkdep_usetex
+        return checkdep_usetex(True)
+    except ImportError:
+        print("This function is not available, you may be missing matplotlib.")
+
 
 def plot_persistence_barcode(
     persistence=[],
@@ -121,7 +117,7 @@ def plot_persistence_barcode(
         import matplotlib.pyplot as plt
         import matplotlib.patches as mpatches
         from matplotlib import rc
-        if _gudhi_matplotlib_use_tex:
+        if _gudhi_matplotlib_use_tex and _matplotlib_can_use_tex():
             plt.rc('text', usetex=True)
             plt.rc('font', family='serif')
         else:
@@ -270,7 +266,7 @@ def plot_persistence_diagram(
         import matplotlib.pyplot as plt
         import matplotlib.patches as mpatches
         from matplotlib import rc
-        if _gudhi_matplotlib_use_tex:
+        if _gudhi_matplotlib_use_tex and _matplotlib_can_use_tex():
             plt.rc('text', usetex=True)
             plt.rc('font', family='serif')
         else:
@@ -446,7 +442,7 @@ def plot_persistence_density(
         import matplotlib.patches as mpatches
         from scipy.stats import kde
         from matplotlib import rc
-        if _gudhi_matplotlib_use_tex:
+        if _gudhi_matplotlib_use_tex and _matplotlib_can_use_tex():
             plt.rc('text', usetex=True)
             plt.rc('font', family='serif')
         else: