prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  ParamScheduler docs missing
  No docs on `ParamScheduler` and related classes on the [site](https://pytorch.org/ignite/contrib/handlers.html).
  
  </issue>
  <code>
  [start of ignite/contrib/handlers/__init__.py]
  1 
  2 from ignite.contrib.handlers.param_scheduler import ParamScheduler, CyclicalScheduler, \
  3     LinearCyclicalScheduler, CosineAnnealingScheduler
  4 
  5 from ignite.contrib.handlers.tqdm_logger import ProgressBar
  6 
  7 __all__ = ['ProgressBar']
  8
  [end of ignite/contrib/handlers/__init__.py]
  [start of ignite/contrib/engines/__init__.py]
  1 # coding: utf-8
  2 
  3 from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer
  4 from ignite.contrib.engines.tbptt import Tbptt_Events
  5 
  6 
  7 __all__ = ["create_supervised_tbptt_trainer", "Tbptt_Events"]
  8
  [end of ignite/contrib/engines/__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/ignite/contrib/engines/__init__.py b/ignite/contrib/engines/__init__.py
  --- a/ignite/contrib/engines/__init__.py
  +++ b/ignite/contrib/engines/__init__.py
  @@ -2,6 +2,3 @@
   
   from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer
   from ignite.contrib.engines.tbptt import Tbptt_Events
  -
  -
  -__all__ = ["create_supervised_tbptt_trainer", "Tbptt_Events"]
  diff --git a/ignite/contrib/handlers/__init__.py b/ignite/contrib/handlers/__init__.py
  --- a/ignite/contrib/handlers/__init__.py
  +++ b/ignite/contrib/handlers/__init__.py
  @@ -3,5 +3,3 @@
       LinearCyclicalScheduler, CosineAnnealingScheduler
   
   from ignite.contrib.handlers.tqdm_logger import ProgressBar
  -
  -__all__ = ['ProgressBar']
  
verification_info: {"golden_diff": "diff --git a/ignite/contrib/engines/__init__.py b/ignite/contrib/engines/__init__.py\n--- a/ignite/contrib/engines/__init__.py\n+++ b/ignite/contrib/engines/__init__.py\n@@ -2,6 +2,3 @@\n \n from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer\n from ignite.contrib.engines.tbptt import Tbptt_Events\n-\n-\n-__all__ = [\"create_supervised_tbptt_trainer\", \"Tbptt_Events\"]\ndiff --git a/ignite/contrib/handlers/__init__.py b/ignite/contrib/handlers/__init__.py\n--- a/ignite/contrib/handlers/__init__.py\n+++ b/ignite/contrib/handlers/__init__.py\n@@ -3,5 +3,3 @@\n     LinearCyclicalScheduler, CosineAnnealingScheduler\n \n from ignite.contrib.handlers.tqdm_logger import ProgressBar\n-\n-__all__ = ['ProgressBar']\n", "issue": "ParamScheduler docs missing\nNo docs on `ParamScheduler` and related classes on the [site](https://pytorch.org/ignite/contrib/handlers.html).\n", "before_files": [{"content": "\nfrom ignite.contrib.handlers.param_scheduler import ParamScheduler, CyclicalScheduler, \\\n    LinearCyclicalScheduler, CosineAnnealingScheduler\n\nfrom ignite.contrib.handlers.tqdm_logger import ProgressBar\n\n__all__ = ['ProgressBar']\n", "path": "ignite/contrib/handlers/__init__.py"}, {"content": "# coding: utf-8\n\nfrom ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer\nfrom ignite.contrib.engines.tbptt import Tbptt_Events\n\n\n__all__ = [\"create_supervised_tbptt_trainer\", \"Tbptt_Events\"]\n", "path": "ignite/contrib/engines/__init__.py"}]}