matplotlib with psyco

Community matplotlib-users
1

Hi,

While testing Psyco V2 to see if it would offer any speed improvements I tried it with some applications using matplotlib. Exceptions were raised that were easily resolved by replacing calls to min() and max() with their numpy equivalents numpy.amin() and numpy.amax() in the matplotlib code.

Simply demonstrated by inserting at the beginning of, say, matplotlib's examples/api/barchart_demo.py :

import psyco
psyco.full()

which caused:

Traceback (most recent call last):
   File "barchart_demo.py", line 29, in <module>
     ax.set_xticks(ind+width)
   File "c:\python26\lib\site-packages\matplotlib\axes.py", line 2064, in set_xticks
     return self.xaxis.set_ticks(ticks, minor=minor)
   File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1154, in set_ticks
     self.set_view_interval(min(ticks), max(ticks))
   File "c:\python26\lib\site-packages\psyco\builtin.py", line 75, in min
     return _min(*args)
   File "c:\python26\lib\site-packages\psyco\builtin.py", line 34, in _min
     if not iterable:
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

software used:

Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import psyco
>>> psyco.version_info
(2, 0, 0, 'final', 0)
>>> import numpy
>>> numpy.version.version
'1.4.1'
>>> import matplotlib
>>> matplotlib.__version__
'0.99.3'

Psyco V2 is available from: http://codespeak.net/svn/psyco/v2/dist/

Should numpy.min()/numpy.amin() be used on array like objects within matplotlib, or is min() adequate ? Ditto max().

Stephen Evans

(Out of interest I came across numpy ticket #1286 while looking for this issue.)

2

Hi,

While testing Psyco V2 to see if it would offer any speed improvements I
tried it with some applications using matplotlib. Exceptions were raised
that were easily resolved by replacing calls to min() and max() with
their numpy equivalents numpy.amin() and numpy.amax() in the matplotlib
code.

Simply demonstrated by inserting at the beginning of, say, matplotlib's
examples/api/barchart_demo.py :

import psyco
psyco.full()

which caused:

Traceback (most recent call last):
    File "barchart_demo.py", line 29, in<module>
      ax.set_xticks(ind+width)
    File "c:\python26\lib\site-packages\matplotlib\axes.py", line 2064,
in set_xticks
      return self.xaxis.set_ticks(ticks, minor=minor)
    File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1154,
in set_ticks
      self.set_view_interval(min(ticks), max(ticks))
    File "c:\python26\lib\site-packages\psyco\builtin.py", line 75, in min
      return _min(*args)
    File "c:\python26\lib\site-packages\psyco\builtin.py", line 34, in _min
      if not iterable:
ValueError: The truth value of an array with more than one element is
ambiguous. Use a.any() or a.all()

software used:

Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
  >>> import psyco
  >>> psyco.version_info
(2, 0, 0, 'final', 0)
  >>> import numpy
  >>> numpy.version.version
'1.4.1'
  >>> import matplotlib
  >>> matplotlib.__version__
'0.99.3'

Psyco V2 is available from: http://codespeak.net/svn/psyco/v2/dist/

Should numpy.min()/numpy.amin() be used on array like objects within
matplotlib, or is min() adequate ? Ditto max().

When short sequences are involved, min() is much faster than amin(). If min() is called only a few times per plot in such cases, using the slower function would cause a negligible slowdown. I'm reluctant to change mpl to work around a bug in psyco, though.

When you did make the substitution and do the test, was there a big speedup?

Eric

···

On 07/14/2010 11:41 AM, Stephen Evans wrote:

Stephen Evans

(Out of interest I came across numpy ticket #1286 while looking for this
issue.)

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3

   

Hi,

While testing Psyco V2 to see if it would offer any speed improvements I
tried it with some applications using matplotlib. Exceptions were raised
that were easily resolved by replacing calls to min() and max() with
their numpy equivalents numpy.amin() and numpy.amax() in the matplotlib
code.

Simply demonstrated by inserting at the beginning of, say, matplotlib's
examples/api/barchart_demo.py :

import psyco
psyco.full()

which caused:

Traceback (most recent call last):
     File "barchart_demo.py", line 29, in<module>
       ax.set_xticks(ind+width)
     File "c:\python26\lib\site-packages\matplotlib\axes.py", line 2064,
in set_xticks
       return self.xaxis.set_ticks(ticks, minor=minor)
     File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1154,
in set_ticks
       self.set_view_interval(min(ticks), max(ticks))
     File "c:\python26\lib\site-packages\psyco\builtin.py", line 75, in min
       return _min(*args)
     File "c:\python26\lib\site-packages\psyco\builtin.py", line 34, in _min
       if not iterable:
ValueError: The truth value of an array with more than one element is
ambiguous. Use a.any() or a.all()

software used:

Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
   >>> import psyco
   >>> psyco.version_info
(2, 0, 0, 'final', 0)
   >>> import numpy
   >>> numpy.version.version
'1.4.1'
   >>> import matplotlib
   >>> matplotlib.__version__
'0.99.3'

Psyco V2 is available from: http://codespeak.net/svn/psyco/v2/dist/

Should numpy.min()/numpy.amin() be used on array like objects within
matplotlib, or is min() adequate ? Ditto max().
     

When short sequences are involved, min() is much faster than amin(). If
min() is called only a few times per plot in such cases, using the
slower function would cause a negligible slowdown. I'm reluctant to
change mpl to work around a bug in psyco, though.

When you did make the substitution and do the test, was there a big speedup?

Eric
   
For a quick check of any speedup I timed some runs on two plots using one of my applications with real world data. 4 runs, average of last 3, with some meaningless precision:

a) one subplot of 44000 points
b) two subplots of 1.4M points each

using freshly installed matplotlib 1.0

a) 2.97 seconds
b) 37.85

with psyco and changing min() max() to numpy.amin() numpy.amax() where appropriate in matplotlib

a) 3.05
b) 27.48

without psyco, but with the changes above

a) 2.96
b) 37.52

Not a rigorous test, but psyco causes a definite speedup in the larger plot. Whether this applies throughout matplotlib on all platforms is another matter. Hopefully anyone who is using psyco with numpy/matplotlib should be able to patch matplotlib themselves where required. If it ain't broke, don't fix it.

Stephen

···

On 14/07/2010 23:32, Eric Firing wrote:

On 07/14/2010 11:41 AM, Stephen Evans wrote:

Stephen Evans

(Out of interest I came across numpy ticket #1286 while looking for this
issue.)

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