Source code for brian2.__init__

Brian 2

def _check_dependencies():
    '''Check basic dependencies'''
    import sys
    missing = []
        import numpy
    except ImportError as ex:
        sys.stderr.write('Importing numpy failed: %s\n' % ex)
        import sympy
    except ImportError as ex:
        sys.stderr.write('Importing sympy failed: %s\n' % ex)
        import pyparsing
    except ImportError as ex:
        sys.stderr.write('Importing pyparsing failed: %s\n' % ex)
        import jinja2
    except ImportError as ex:
        sys.stderr.write('Importing Jinja2 failed: %s\n' % ex)

    if len(missing):
        raise ImportError('Some required dependencies are missing:\n' + ', '.join(missing))


    from pylab import *
except ImportError:
    # Do the non-matplotlib pylab imports manually
    from numpy import *
    from numpy.fft import *
    from numpy.random import *
    from numpy.linalg import *
    import as ma
    # don't let numpy's datetime hide stdlib
    import datetime

# Make sure that Brian's unit-aware functions are used, even when directly
# using names prefixed with numpy or np
import brian2.numpy_ as numpy
import brian2.numpy_ as np

# delete some annoying names from the namespace
if 'x' in globals():
    del x
if 'f' in globals():
    del f
if 'rate' in globals():
    del rate

__docformat__ = "restructuredtext en"

__version__ = '2.4.2'
__release_date__ = '2020-10-28'

from brian2.only import *
from brian2.only import test

# Check for outdated dependency versions
def _check_dependency_version(name, version):
    from distutils.version import LooseVersion
    from .core.preferences import prefs
    from .utils.logger import get_logger
    import sys
    logger = get_logger(__name__)

    module = sys.modules[name]
    if not isinstance(module.__version__, str):  # mocked module
    if not LooseVersion(module.__version__) >= LooseVersion(version):
        message = '%s is outdated (got version %s, need version %s)' % (name,
        if prefs.core.outdated_dependency_error:
            raise ImportError(message)

            logger.warn(message, 'outdated_dependency')

def _check_dependency_versions():
    for name, version in [('numpy',  '1.10'),
                          ('sympy',  '1.2'),
                          ('jinja2', '2.7')]:
        _check_dependency_version(name, version)


# Initialize the logging system
logger = get_logger(__name__)

# Check the caches
def _get_size_recursively(dirname):
    import os
    total_size = 0
    for dirpath, _, filenames in os.walk(dirname):
        for fname in filenames:
            # When other simulations are running, files may disappear while
            # we walk through the directory (in particular with Cython, where
            # we delete the source files after compilation by default)
                size = os.path.getsize(os.path.join(dirpath, fname))
                total_size += size
            except (OSError, IOError):
                pass  # ignore the file
    return total_size

#: Stores the cache directory for code generation targets
_cache_dirs_and_extensions = {}

[docs]def check_cache(target): cache_dir, _ = _cache_dirs_and_extensions.get(target, (None, None)) if cache_dir is None: return size = _get_size_recursively(cache_dir) size_in_mb = int(round(size/1024./1024.)) if size_in_mb > prefs.codegen.max_cache_dir_size:'Cache size for target "{target}": {size} MB.\n' 'You can call "clear_cache(\'{target}\')" to delete all ' 'files from the cache or manually delete files in the ' '"{cache_dir}" directory.'.format(target=target, size=size_in_mb, cache_dir=cache_dir)) else: logger.debug('Cache size for target "%s": %s MB' % (target, size_in_mb))
[docs]def clear_cache(target): ''' Clears the on-disk cache with the compiled files for a given code generation target. Parameters ---------- target : str The code generation target (e.g. ``'cython'``) Raises ------ ValueError If the given code generation target does not have an on-disk cache IOError If the cache directory contains unexpected files, suggesting that deleting it would also delete files unrelated to the cache. ''' import os import shutil cache_dir, extensions = _cache_dirs_and_extensions.get(target, (None, None)) if cache_dir is None: raise ValueError('No cache directory registered for target ' '"%s".' % target) cache_dir = os.path.abspath(cache_dir) # just to make sure... for folder, _, files in os.walk(cache_dir): for f in files: for ext in extensions: if f.endswith(ext): break else: raise IOError("The cache directory for target '{}' contains " "the file '{}' of an unexpected type and " "will therefore not be removed. Delete files in " "'{}' manually".format(target, os.path.join(folder, f), cache_dir)) logger.debug('Clearing cache for target "%s" (directory "%s").' % (target, cache_dir)) shutil.rmtree(cache_dir)
def _check_caches(): from brian2.codegen.runtime.cython_rt.extension_manager import get_cython_cache_dir from brian2.codegen.runtime.cython_rt.extension_manager import get_cython_extensions for target, (dirname, extensions) in [('cython', (get_cython_cache_dir(), get_cython_extensions()))]: _cache_dirs_and_extensions[target] = (dirname, extensions) if prefs.codegen.max_cache_dir_size > 0: check_cache(target) _check_caches()