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__author__ = 'Maximilian Bisani'
__version__ = '$LastChangedRevision: 95 $'
__date__ = '$LastChangedDate: 2007-06-02 16:32:35 +0200 (Sat, 02 Jun 2007) $'
__copyright__ = 'Copyright (c) 2004-2005 RWTH Aachen University'
__license__ = """
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License Version 2 (June
1991) as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, you will find it at
http://www.gnu.org/licenses/gpl.html, or write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
USA.
Should a provision of no. 9 and 10 of the GNU General Public License
be invalid or become invalid, a valid provision is deemed to have been
agreed upon which comes closest to what the parties intended
commercially. In any case guarantee/warranty shall be limited to gross
negligent actions or intended actions or fraudulent concealment.
"""
# ===========================================================================
ctypedef int size_t
cdef extern from "string.h":
void *memcpy(void *dest, void *src, size_t n)
int memcmp(void *s1, void *s2, size_t n)
cdef extern from "stdlib.h":
void qsort(void *base, size_t nmemb, size_t size, int(*compar)(void*, void*))
cdef extern from "stdio.h":
struct FILE
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
size_t fwrite(void *ptr, size_t size, size_t nmemb, FILE *stream)
cdef extern from "Python.h":
void *PyMem_Malloc(size_t n)
void *PyMem_Realloc(void*, size_t)
void PyMem_Free(void *p)
int PyFile_Check(p)
FILE* PyFile_AsFile(p)
PyErr_SetFromErrno(p)
# ===========================================================================
cdef struct Item:
int key
double value
cdef int item_cmp(Item *a, Item *b):
return a.key - b.key
cdef class SparseVector:
cdef readonly int size
cdef Item *data
def __new__(self, int size):
self.size = size
if size > 0:
self.data = <Item*> PyMem_Malloc(size * sizeof(Item))
else:
self.data = NULL
def __dealloc__(self):
PyMem_Free(self.data)
def __copy__(self):
cdef SparseVector result
result = SparseVector(self.size)
memcpy(result.data, self.data, self.size * sizeof(Item))
return result
def __cmp__(self, SparseVector othr):
if self.size != othr.size:
return self.size - othr.size
else:
return memcmp(self.data, othr.data, self.size * sizeof(Item))
def __nonzero__(self):
return self.size
def __iter__(self):
return SparseVectorIter(self)
def __contains__(self, int key):
return self.find(key) != NULL
def __getitem__(self, int key):
cdef Item *l
l = self.find(key)
if l == NULL:
return 0.0
return l.value
cdef Item *find(self, int key):
cdef Item *l, *r, *m
l = self.data
r = self.data + self.size
while l < r:
if l.key == key:
return l
if (r - l) < 8: # TUNE ME
l = l + 1
else:
m = l + (r - l) / 2
if key < m.key:
r = m
else:
l = m
return NULL
cdef sort(self):
qsort(self.data, self.size, sizeof(Item),
<int ((*)(void (*),void (*)))> item_cmp)
cdef consolidate(self):
if self.size == 0: return
cdef i, j, oldSize
j = 0
oldSize = self.size
for i from 1 <= i < oldSize:
if self.data[i].key == self.data[j].key:
self.data[j].value = self.data[j].value + self.data[i].value
else:
j = j + 1
self.data[j] = self.data[i]
self.size = j + 1
if self.size < oldSize*2/3:
self.data = <Item*> PyMem_Realloc(self.data, self.size * sizeof(Item))
def __add__(SparseVector self, SparseVector othr not None):
cdef Item *ai, *bi, *pi
cdef SparseVector result
result = SparseVector(self.size + othr.size)
pi = result.data
ai = self.data
bi = othr.data
while (ai - self.data < self.size) and (bi - othr.data < othr.size):
if ai.key == bi.key:
pi.key = ai.key
pi.value = ai.value + bi.value
ai = ai + 1
bi = bi + 1
elif ai.key < bi.key:
pi[0] = ai[0]
ai = ai + 1
else:
pi[0] = bi[0]
bi = bi + 1
pi = pi + 1
while ai - self.data < self.size:
pi[0] = ai[0]
ai = ai + 1
pi = pi + 1
while bi - othr.data < othr.size:
pi[0] = bi[0]
bi = bi + 1
pi = pi + 1
result.size = pi - result.data
if result.size < (self.size + othr.size)*2/3:
result.data = <Item*> PyMem_Realloc(result.data, result.size * sizeof(Item))
return result
def __mul__(SparseVector self, double den):
cdef SparseVector result
result = self.__copy__()
cdef i
for i from 0 <= i < result.size:
result.data[i].value = result.data[i].value * den
return result
def __truediv__(SparseVector self, double den):
cdef SparseVector result
result = self.__copy__()
cdef i
for i from 0 <= i < result.size:
result.data[i].value = result.data[i].value / den
return result
def sum(self):
cdef double result
cdef int i
result = 0.0
for i from 0 <= i < self.size:
result = result + self.data[i].value
return result
def threshold(self, double minValue):
cdef i, j
j = 0
for i from 0 <= i < self.size:
if self.data[i].value >= minValue:
j = j + 1
cdef SparseVector result
result = SparseVector(j)
if j > 0:
j = 0
for i from 0 <= i < self.size:
if self.data[i].value >= minValue:
result.data[j] = self.data[i]
j = j + 1
return result
cdef class SparseVectorIter:
cdef SparseVector sv
cdef int current
def __init__(self, SparseVector sv):
self.sv = sv
self.current = -1
def __next__(self):
self.current = self.current + 1
if self.current >= self.sv.size:
raise StopIteration
cdef Item *item
item = self.sv.data + self.current
return item.key, item.value
def sparse(seq):
if type(seq) is SparseVector:
return seq
lst = list(seq)
cdef SparseVector sv
sv = SparseVector(len(lst))
cdef int i, k
cdef double v
for i from 0 <= i < len(lst):
k, v = lst[i]
sv.data[i].key = k
sv.data[i].value = v
sv.sort()
for i from 0 < i < sv.size:
if sv.data[i-1].key == sv.data[i].key:
raise ValueError('duplicate key encountered', sv.data[i].key)
return sv
def sumSparse(svs):
if len(svs) == 1:
return svs[0]
elif len(svs) == 0:
return SparseVector(0)
elif len(svs) == 2:
return SparseVector.__add__(*svs)
cdef int totalSize
cdef SparseVector sv
totalSize = 0
for sv in svs:
if sv is None: raise TypeError
totalSize = totalSize + sv.size
cdef SparseVector result
result = SparseVector(totalSize)
cdef Item *tail
tail = result.data
for sv in svs:
memcpy(tail, sv.data, sv.size * sizeof(Item))
tail = tail + sv.size
result.sort()
result.consolidate()
return result
def leftJoinInterpolateAndAddOneSparse(SparseVector aa, double scale, SparseVector bb, int extraKey, double extraValue):
cdef SparseVector result
cdef Item *i, *l, *r, *m
cdef int key
result = SparseVector(aa.size + 1)
result.data[0].key = extraKey
result.data[0].value = extraValue
memcpy(result.data + 1, aa.data, aa.size * sizeof(Item))
l = bb.data
i = result.data + 1
while i < result.data + result.size:
key = i.key
r = l + 8
while r < bb.data + bb.size and r.key <= key:
r = l + 2*(r-l)
if r > bb.data + bb.size:
r = bb.data + bb.size
assert (l == bb.data) or (l[-1].key < key)
while l < r:
if l.key == key:
i.value = i.value + scale * l.value
break
if (r - l) < 8: # TUNE ME
if l.key > key: break
l = l + 1
else:
m = l + (r - l) / 2
if key < m.key:
r = m
else:
l = m
i = i + 1
return result
def dump(SparseVector sv not None, file):
assert PyFile_Check(file)
cdef FILE *f
f = PyFile_AsFile(file)
if fwrite(&sv.size, sizeof(int), 1, f) != 1:
PyErr_SetFromErrno(IOError)
if fwrite(sv.data, sizeof(Item), sv.size, f) != sv.size:
PyErr_SetFromErrno(IOError)
def load(file):
assert PyFile_Check(file)
cdef FILE *f
f = PyFile_AsFile(file)
cdef int size
if fread(&size, sizeof(int), 1, f) != 1:
PyErr_SetFromErrno(IOError)
cdef SparseVector sv
sv = SparseVector(size)
if fread(sv.data, sizeof(Item), size, f) != size:
PyErr_SetFromErrno(IOError)
return sv
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