Support for new cython and fix ci

.travis.yml

@@ -4,6 +4,11 @@ python:
   - "2.7"
   - "3.4"
   - "3.5"
+matrix:
+  include:
+    - python: 3.7
+      dist: xenial
+      sudo: true
 install:
   # We do this conditionally because it saves us some downloading if the
   # version is the same.

appveyor.yml

@@ -12,45 +12,32 @@ environment:
     - PYTHON: "C:\\Python27"
       PYTHON_VERSION: "2.7.8"
       PYTHON_ARCH: "32"
-      MINICONDA: "C:\\Miniconda"
 
     - PYTHON: "C:\\Python27-x64"
       PYTHON_VERSION: "2.7.8"
       PYTHON_ARCH: "64"
-      MINICONDA: "C:\\Miniconda-x64"
 
-    - PYTHON: "C:\\Python35"
-      PYTHON_VERSION: "3.5.0"
+    - PYTHON: "C:\\Python37"
+      PYTHON_VERSION: "3.7.0"
       PYTHON_ARCH: "32"
-      MINICONDA: "C:\\Miniconda35"
 
-    - PYTHON: "C:\\Python35-x64"
-      PYTHON_VERSION: "3.5.0"
+    - PYTHON: "C:\\Python37-x64"
+      PYTHON_VERSION: "3.7.0"
       PYTHON_ARCH: "64"
-      MINICONDA: "C:\\Miniconda35-x64"
 
 
 
 install:
   # Miniconda is pre-installed in the worker build
-  - "SET PATH=%MINICONDA%;%MINICONDA%\\Scripts;%PATH%"
+  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - "python -m pip install -U pip"
 
   # Check that we have the expected version and architecture for Python
   - "python --version"
   - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
   - "pip --version"
 
-  # Remove cygwin because it clashes with conda
-  # see http://help.appveyor.com/discussions/problems/3712-git-remote-https-seems-to-be-broken
-  - rmdir C:\\cygwin /s /q
-
-  # Update previous packages and install the build and runtime dependencies of the project.
-  - conda update --all --yes
-  - conda install --quiet --yes numpy scipy cython nose scikit-learn wheel"
-  # there seems to be a problem with conda-build 1.21.0 on python27 and win64, avoid this
-  # by using a previous version
-  - conda install --quiet --yes conda-build=1.21.0
+  - "%CMD_IN_ENV% pip install --timeout=60 numpy scipy cython nose scikit-learn wheel"
   - "%CMD_IN_ENV% python setup.py bdist_wheel bdist_wininst"
 
   - ps: "ls dist"

lightning/impl/adagrad_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD

lightning/impl/dataset_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD

lightning/impl/dual_cd_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD
@@ -223,7 +224,7 @@ def _dual_cd(self,
 
         # Verbose output.
         if verbose >= 1:
-            print "iter", t + 1, M - m, "(%d)" % active_size
+            print("iter", t + 1, M - m, "(%d)" % active_size)
 
         if stop:
             break
@@ -232,7 +233,7 @@ def _dual_cd(self,
         if M - m <= tol:
             if active_size == n_samples:
                 if verbose >= 1:
-                    print "\nConverged at iteration", t
+                    print("\nConverged at iteration", t)
                 break
             else:
                 # When shrinking is enabled, we need to do one more outer
@@ -320,7 +321,7 @@ def _dual_cd_auc(self,
     # Learning
     for t in xrange(max_iter):
         if verbose >= 1:
-            print "\nIteration", t
+            print("\nIteration", t)
 
         for tt in xrange(n_samples):
             r = rs.randint(n_pos - 1)
@@ -455,7 +456,7 @@ def _dual_cd_svr(self,
     # Learning...
     for t in xrange(max_iter):
         if verbose >= 1:
-            print "\nIteration", t
+            print("\nIteration", t)
 
         if permute:
             rs.shuffle(A)
@@ -532,17 +533,17 @@ def _dual_cd_svr(self,
             violation_init = violation_sum
 
         if verbose >= 1:
-            print t, violation_sum / violation_init
+            print(t, violation_sum / violation_init)
 
         if violation_sum / violation_init < tol:
             if verbose >= 1:
-                print "Converged"
+                print("Converged")
             break
 
     # end for t
 
     if verbose >= 1:
-        print
+        print()
 
     for i in xrange(n_samples):
         ii = i * 2

lightning/impl/loss_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD

lightning/impl/prank_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD

lightning/impl/primal_cd_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Author: Mathieu Blondel
 # License: BSD
@@ -86,7 +87,7 @@ cdef class LossFunction:
             if step >= self.max_steps:
                 if self.max_steps > 1:
                     if self.verbose >= 2:
-                        print "Max steps reached during line search..."
+                        print("Max steps reached during line search...")
                     recompute = 1
                 break
 
@@ -223,7 +224,7 @@ cdef class LossFunction:
                  Lp_n < -violation_old / n_samples:
                 # Shrink!
                 if self.verbose >= 3:
-                    print "Shrink variable", j
+                    print("Shrink variable", j)
                 return 1
         elif w[j] > 0:
             violation[0] = fabs(Lp_p)
@@ -262,7 +263,7 @@ cdef class LossFunction:
             if step >= self.max_steps:
                 if self.max_steps > 1:
                     if self.verbose >= 2:
-                        print "Max steps reached during line search..."
+                        print("Max steps reached during line search...")
                     recompute = 1
                 break
 
@@ -379,7 +380,7 @@ cdef class LossFunction:
                  g_norm + violation_old / nv <= 0:
                 # Shrink!
                 if self.verbose >= 2:
-                    print "Shrink variable", j
+                    print("Shrink variable", j)
                 return 1
         else:
             violation[0] = fabs(g_norm - alpha)
@@ -434,7 +435,7 @@ cdef class LossFunction:
             if step >= self.max_steps:
                 if self.max_steps > 1:
                     if self.verbose >= 2:
-                        print "Max steps reached during line search..."
+                        print("Max steps reached during line search...")
                     recompute = 1
                 break
 
@@ -1365,11 +1366,11 @@ def _primal_cd(self,
         # Verbose output.
         if verbose >= 1:
             if check_violation_sum:
-                print "iter", t + 1, violation_sum / violation_init, \
-                      "(%d)" % active_size
+                print("iter", t + 1, violation_sum / violation_init,
+                      "(%d)" % active_size)
             elif check_violation_max:
-                print "iter", t + 1, violation_max / violation_init, \
-                      "(%d)" % active_size
+                print("iter", t + 1, violation_max / violation_init,
+                      "(%d)" % active_size)
 
         # Check convergence.
         if (check_violation_sum and
@@ -1378,7 +1379,7 @@ def _primal_cd(self,
             violation_max <= tol * violation_init):
             if active_size == active_size_start:
                 if verbose >= 1:
-                    print "\nConverged at iteration", t
+                    print("\nConverged at iteration", t)
                 break
             else:
                 # When shrinking is enabled, we need to do one more outer

lightning/impl/prox_fast.pyx

@@ -2,6 +2,7 @@
 # cython: cdivision=True
 # cython: boundscheck=False
 # cython: wraparound=False
+# cython: language_level=3
 #
 # Authors: Fabian Pedregosa
 #