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sddekit.py
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sddekit.py
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# copyright 2016 Apache 2 sddekit authors
import ctypes
import logging
logging.basicConfig(level=logging.DEBUG)
LOG = logging.getLogger('SDDEKit')
LIB_NAME = 'build/libSDDEKit.so'
LOG.info("using shared library %r" % (LIB_NAME, ))
LIB = ctypes.CDLL(LIB_NAME)
# common data types
u32, f64 = ctypes.c_uint32, ctypes.c_double
u32p, f64p = ctypes.POINTER(u32), ctypes.POINTER(f64)
def make_enum(name, member_names): # {{{
members = {}
for i, member in enumerate(members):
members[member] = ctypes.c_uint(i)
def repr(self):
return self.member_names[self.value]
def eq(self, other):
return self.value == other.value
enum_class = type(name, (ctypes.c_uint, ), {
'members': members,
'member_names': member_names[:],
'__repr__': repr,
'__eq__': eq
})
for i, member in enumerate(member_names):
setattr(enum_class, member, enum_class(i))
return enum_class
#}}}
def make_func(name, restype=None, *argtypes): #{{{
fn = getattr(LIB, name)
fn.restype = restype
fn.argtypes = list(argtypes)
return fn
#}}}
sd_stat = make_enum('sd_stat',
'OK ERR CONT STOP UKNOWN ZERO NON_ZERO OUT_OF_BOUNDS'.split(' '))
# util/ver.h {{{
sd_ver_major = make_func('sd_ver_major', ctypes.c_uint32)
sd_ver_minor = make_func('sd_ver_minor', ctypes.c_uint32)
#}}}
# util/malloc.h {{{
sd_malloc_reg_init = make_func('sd_malloc_reg_init')
sd_malloc_reg_stop = make_func('sd_malloc_reg_stop')
sd_malloc_reg_query = make_func('sd_malloc_reg_query', sd_stat, ctypes.c_void_p)
sd_malloc_total_nbytes = make_func('sd_malloc_total_nbytes', ctypes.c_uint32)
#}}}
# util/log.h {{{
sd_log_level = make_enum('sd_log_level', 'ERROR INFO DEBUG'.split(' '))
sd_log_handler = ctypes.CFUNCTYPE(None, sd_log_level, ctypes.c_char_p)
sd_log_set_handler = make_func('sd_log_set_handler', None, sd_log_handler)
sd_log_get_handler = make_func('sd_log_get_handler', sd_log_handler)
sd_log_get_err_and_reset = make_func('sd_log_get_err_and_reset', ctypes.c_bool)
class SDDEKitException(Exception): pass
@sd_log_handler
def handler(level, message):
if level == sd_log_level.DEBUG:
LOG.debug(message)
elif level == sd_log_level.INFO:
LOG.info(message)
elif level == sd_log_level.ERROR:
handler.last_error_message = message
LOG.error(message)
else:
fmt = 'unhandled SDDEKit log level %r for message %r'
LOG.warn(fmt, level, message)
def check_and_raise():
if sd_log_get_err_and_reset():
raise SDDEKitException(handler.last_error_message)
sd_log_set_handler(handler)
#}}}
# util/interface_macros.h {{{
def _common_fields(type):
ptr = ctypes.POINTER(type)
fp = ctypes.CFUNCTYPE
return [
('data', ctypes.c_void_p),
('copy', fp(ptr, ptr)),
('n_byte', fp(u32, ptr)),
('free', fp(None, ptr))
]
def make_fp_members(struct, *members):
_fields_ = _common_fields(struct.__name__)
ptr = ctypes.POINTER(struct)
for name, sig in members:
sig = (sig[0], ptr) + sig[1:]
_fields_.append((name, ctypes.CFUNCTYPE(*sig)))
struct._fields_ = _fields_
def make_struct(name, *members):
struct = type(name, (ctypes.Structure, ), {})
make_fp_members(struct, *members)
return struct
#}}}
# conn/base.h {{{
sd_conn = make_struct('sd_conn',
('row_wise_weighted_sum', (None, f64p, f64p)),
('get_n_nonzeros', (u32, )),
('get_nonzero_indices', (u32p, )),
('get_weights', (f64p, )),
('get_delays', (f64p, )),
('get_delay_scale', (f64, )),
('set_delay_scale', (sd_stat, f64)),
('get_n_row', (u32, )),
('get_n_col', (u32, ))
)
sd_conn_p = ctypes.POINTER(sd_conn)
sd_conn_new_sparse = make_func('sd_conn_new_sparse',
sd_conn_p, u32, u32, u32, u32p, u32p, f64p, f64p)
sd_conn_new_dense = make_func('sd_conn_new_dense',
sd_conn_p, u32, u32, f64p, f64p)
#}}}
def ndf64p(array):
return array.ctypes.data_as(f64p)
def make_class(struct, *):
attrs = {}
@classmethod
def new_dense(cls, W, D):
obj = cls()
n = len(W)
obj._ptr = sd_conn_new_dense(n, n, ndf64p(W), ndf64p(D))
check_and_raise()
return obj
attrs['new_dense'] = new_dense
for name, fp in struct._fields_:
def wrap(self, *args):
import numpy as np
W = np.random.randn(50, 50)
W = (W > 2.0) * W
D = np.ones((50, 50))
conn = sd_conn_new_dense(50, 50, W.ctypes.data_as(f64p), D.ctypes.data_as(f64p))
c = conn.contents
scale = 42.42
assert c.set_delay_scale(conn, scale) == sd_stat.OK
assert c.get_delay_scale(conn) == scale
assert c.get_n_row(conn) == 50 and c.get_n_col(conn) == 50
assert c.get_n_nonzeros(conn) == (W!=0.0).sum()
print c.set_delay_scale(conn, -42.42)
check_and_raise()
# vim: foldmethod=marker