Source code for brian2.__init__

Brian 2

import logging

def _check_dependencies():
    """Check basic dependencies"""
    import sys

    missing = []
        import numpy
    except ImportError as ex:
        sys.stderr.write(f"Importing numpy failed: '{ex}'\n")
        import sympy
    except ImportError as ex:
        sys.stderr.write(f"Importing sympy failed: '{ex}'\n")
        import pyparsing
    except ImportError as ex:
        sys.stderr.write(f"Importing pyparsing failed: '{ex}'\n")
        import jinja2
    except ImportError as ex:
        sys.stderr.write(f"Importing Jinja2 failed: '{ex}'\n")

    if len(missing):
        raise ImportError(
            f"Some required dependencies are missing:\n{', '.join(missing)}"


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

    import as ma
    from numpy import *
    from numpy.fft import *
    from numpy.linalg import *
    from numpy.random import *

# 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

    from ._version import __version__, __version_tuple__
except ImportError:
        from setuptools_scm import get_version

        __version__ = get_version(
        __version_tuple__ = tuple(int(x) for x in __version__.split(".")[:3])
    except ImportError:
            "Cannot determine Brian version, running from source and "
            "setuptools_scm is not installed."
        __version__ = "unknown"
        __version_tuple__ = (0, 0, 0)

# 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"

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

# Check for outdated dependency versions
def _check_dependency_version(name, version):
    import sys

    from packaging.version import Version

    from .core.preferences import prefs
    from .utils.logger import get_logger

    logger = get_logger(__name__)

    module = sys.modules[name]
    if not isinstance(module.__version__, str):  # mocked module
    if not Version(module.__version__) >= Version(version):
        message = (
            f"{name} is outdated (got version {module.__version__}, need version"
            f" {version})"
        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:
                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 / 1024.0 / 1024.0)) if size_in_mb > prefs.codegen.max_cache_dir_size: f"Cache size for target '{target}': {size_in_mb} MB.\n" f"You can call clear_cache('{target}') to delete all " "files from the cache or manually delete files in the " f"'{cache_dir}' directory." ) else: logger.debug(f"Cache size for target '{target}': {size_in_mb} 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(f'No cache directory registered for target "{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 OSError( f"The cache directory for target '{target}' contains " f"the file '{os.path.join(folder, f)}' of an unexpected type and " "will therefore not be removed. Delete files in " f"'{cache_dir}' manually" ) logger.debug(f"Clearing cache for target '{target}' (directory '{cache_dir}').") shutil.rmtree(cache_dir)
def _check_caches(): from brian2.codegen.runtime.cython_rt.extension_manager import ( get_cython_cache_dir, 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()