prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  module 'netket' has no attribute 'MPI'
  With the merge #193 we have lost the MPI module 
  
  </issue>
  <code>
  [start of netket/__init__.py]
  1 # Copyright 2019 The Simons Foundation, Inc. - All Rights Reserved.
  2 #
  3 # Licensed under the Apache License, Version 2.0 (the "License");
  4 # you may not use this file except in compliance with the License.
  5 # You may obtain a copy of the License at
  6 #
  7 #    http://www.apache.org/licenses/LICENSE-2.0
  8 #
  9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 
  15 from __future__ import absolute_import
  16 from . import (
  17     _C_netket,
  18     dynamics,
  19     exact,
  20     graph,
  21     hilbert,
  22     layer,
  23     machine,
  24     operator,
  25     optimizer,
  26     output,
  27     sampler,
  28     stats,
  29     supervised,
  30     unsupervised,
  31     utils,
  32     variational,
  33 )
  34
  [end of netket/__init__.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/netket/__init__.py b/netket/__init__.py
  --- a/netket/__init__.py
  +++ b/netket/__init__.py
  @@ -31,3 +31,4 @@
       utils,
       variational,
   )
  +from ._C_netket import MPI, LookupReal, LookupComplex
  
verification_info: {"golden_diff": "diff --git a/netket/__init__.py b/netket/__init__.py\n--- a/netket/__init__.py\n+++ b/netket/__init__.py\n@@ -31,3 +31,4 @@\n     utils,\n     variational,\n )\n+from ._C_netket import MPI, LookupReal, LookupComplex\n", "issue": "module 'netket' has no attribute 'MPI'\nWith the merge #193 we have lost the MPI module \n", "before_files": [{"content": "# Copyright 2019 The Simons Foundation, Inc. - All Rights Reserved.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#    http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nfrom __future__ import absolute_import\nfrom . import (\n    _C_netket,\n    dynamics,\n    exact,\n    graph,\n    hilbert,\n    layer,\n    machine,\n    operator,\n    optimizer,\n    output,\n    sampler,\n    stats,\n    supervised,\n    unsupervised,\n    utils,\n    variational,\n)\n", "path": "netket/__init__.py"}]}