prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Installing arviz breaks pymc3 installation
  **Describe the bug**
  Installing Arviz breaks a pymc3 installation, which is unfortunate because they're built to be compatible. After installation, importing pymc3 throws the following error. 
  
  > WARNING (theano.tensor.blas): Using NumPy C-API based implementation for BLAS functions.
  
  The reason is because arviz installation requires numpy==1.15 rather than numpy>=1.15. If you have 1.16, it uninstalls it and re-installs 1.15. It's annoying to fix. I ended up having to scrap the whole virtual environment and start over.
  
  **To Reproduce**
  Install arviz if you have any version of numpy other than 1.15, then import pymc3. 
  
  **Expected behavior**
  Do not force downgrade of numpy. 
  
  </issue>
  <code>
  [start of arviz/__init__.py]
  1 # pylint: disable=wildcard-import,invalid-name,wrong-import-position
  2 """ArviZ is a library for exploratory analysis of Bayesian models."""
  3 __version__ = "0.3.2"
  4 
  5 import os
  6 import logging
  7 from matplotlib.pyplot import style
  8 
  9 # add ArviZ's styles to matplotlib's styles
  10 arviz_style_path = os.path.join(os.path.dirname(__file__), "plots", "styles")
  11 style.core.USER_LIBRARY_PATHS.append(arviz_style_path)
  12 style.core.reload_library()
  13 
  14 # Configure logging before importing arviz internals
  15 _log = logging.getLogger("arviz")
  16 
  17 if not logging.root.handlers:
  18     handler = logging.StreamHandler()
  19     _log.setLevel(logging.INFO)
  20     _log.addHandler(handler)
  21 
  22 from .data import *
  23 from .plots import *
  24 from .stats import *
  25
  [end of arviz/__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/arviz/__init__.py b/arviz/__init__.py
  --- a/arviz/__init__.py
  +++ b/arviz/__init__.py
  @@ -1,6 +1,6 @@
   # pylint: disable=wildcard-import,invalid-name,wrong-import-position
   """ArviZ is a library for exploratory analysis of Bayesian models."""
  -__version__ = "0.3.2"
  +__version__ = "0.3.3"
   
   import os
   import logging
  
verification_info: {"golden_diff": "diff --git a/arviz/__init__.py b/arviz/__init__.py\n--- a/arviz/__init__.py\n+++ b/arviz/__init__.py\n@@ -1,6 +1,6 @@\n # pylint: disable=wildcard-import,invalid-name,wrong-import-position\n \"\"\"ArviZ is a library for exploratory analysis of Bayesian models.\"\"\"\n-__version__ = \"0.3.2\"\n+__version__ = \"0.3.3\"\n \n import os\n import logging\n", "issue": "Installing arviz breaks pymc3 installation\n**Describe the bug**\r\nInstalling Arviz breaks a pymc3 installation, which is unfortunate because they're built to be compatible. After installation, importing pymc3 throws the following error. \r\n\r\n> WARNING (theano.tensor.blas): Using NumPy C-API based implementation for BLAS functions.\r\n\r\nThe reason is because arviz installation requires numpy==1.15 rather than numpy>=1.15. If you have 1.16, it uninstalls it and re-installs 1.15. It's annoying to fix. I ended up having to scrap the whole virtual environment and start over.\r\n\r\n**To Reproduce**\r\nInstall arviz if you have any version of numpy other than 1.15, then import pymc3. \r\n\r\n**Expected behavior**\r\nDo not force downgrade of numpy. \n", "before_files": [{"content": "# pylint: disable=wildcard-import,invalid-name,wrong-import-position\n\"\"\"ArviZ is a library for exploratory analysis of Bayesian models.\"\"\"\n__version__ = \"0.3.2\"\n\nimport os\nimport logging\nfrom matplotlib.pyplot import style\n\n# add ArviZ's styles to matplotlib's styles\narviz_style_path = os.path.join(os.path.dirname(__file__), \"plots\", \"styles\")\nstyle.core.USER_LIBRARY_PATHS.append(arviz_style_path)\nstyle.core.reload_library()\n\n# Configure logging before importing arviz internals\n_log = logging.getLogger(\"arviz\")\n\nif not logging.root.handlers:\n    handler = logging.StreamHandler()\n    _log.setLevel(logging.INFO)\n    _log.addHandler(handler)\n\nfrom .data import *\nfrom .plots import *\nfrom .stats import *\n", "path": "arviz/__init__.py"}]}