def cluster_vectorspace(self, vectors, trace=False):
# create a cluster for each vector
clusters = [[vector] for vector in vectors]
# This copy module and function is from the python standard library
vector_sum = copy.copy(vectors)
norm_sum = [normalize(vsum) for vsum in vector_sum]
cluster_matrix = numpy.zeros([len(vectors[0]), len(vectors)])
i = 0
for v in norm_sum:
cluster_matrix[:, i] = v
i = i + 1
dot_store_matrix = numpy.dot(cluster_matrix.transpose(), cluster_matrix)
while len(clusters) > max(self._num_clusters, 1):
# find the two best candidate clusters to merge
max_sim = self.array_max(dot_store_matrix)
i = max_sim[0]
j = max_sim[1]
similarity = max_sim[2]
if i == j:
print "got stuck when at " + str(len(clusters)) + " clusters"
break
vsum = clusters[i] + clusters[j]
if trace:
print 'merging %d and %d' % (i, j)
clusters[i] = vsum
del clusters[j]
vector_sum[i] = vector_sum[i] + vector_sum[j]
norm_sum[i] = normalize(vector_sum[i])
cluster_matrix[:, i] = norm_sum[i]
del vector_sum[j]
del norm_sum[j]
cluster_matrix = numpy.delete(cluster_matrix, j, 1)
dot_store_matrix = numpy.dot(cluster_matrix.transpose(), cluster_matrix)
self._dendogram.merge(similarity, i, j)
if self._names:
self._name_dendogram.merge(similarity, i, j)
if len(clusters) % 50 == 0:
print len(clusters)
if self.log_it is not None:
self.log_it(str(len(clusters)))
if self._iterative_reassign:
for i in range(self._max_reassign):
self.get_iteratively_reassigned_clusters(i, saveit=True)
self.update_clusters(len(clusters))
def cluster_vectorspace(self, vectors, trace=False):
# create a cluster for each vector
clusters = [[vector] for vector in vectors]
# This copy module and function is from the python standard library
vector_sum = copy.copy(vectors)
norm_sum = [normalize(vsum) for vsum in vector_sum]
cluster_matrix = numpy.zeros([len(vectors[0]), len(vectors)])
i = 0
for v in norm_sum:
cluster_matrix[:, i] = v
i = i + 1
if self.msg_handle is not None:
self.msg_handle.dm("initializing dot_store_matrix")
dot_store_matrix = numpy.dot(cluster_matrix.transpose(), cluster_matrix)
start = time.time()
while len(clusters) > max(self._num_clusters, 1):
# find the two best candidate clusters to merge
max_sim = self.array_max(dot_store_matrix)
i = max_sim[0]
j = max_sim[1]
if i == j:
print "got stuck when at " + str(len(clusters)) + " clusters"
break;
vsum = clusters[i] + clusters[j]
if trace:
print 'merging %d and %d' % (i, j)
clusters[i] = vsum
del clusters[j]
vector_sum[i] = vector_sum[i] + vector_sum[j]
norm_sum[i] = normalize(vector_sum[i])
cluster_matrix[:, i] = norm_sum[i]
del vector_sum[j]
del norm_sum[j]
cluster_matrix = numpy.delete(cluster_matrix, j, 1)
dot_store_matrix = numpy.dot(cluster_matrix.transpose(), cluster_matrix)
self._dendogram.merge(i, j)
if self._names:
self._name_dendogram.merge(i, j)
end = time.time()
if end - start > 5:
if self.msg_handle is not None:
self.msg_handle.dm(str(len(clusters)))
start = end
else:
print len(clusters)
self.update_clusters(len(clusters))
def get_iteratively_reassigned_clusters(self, num_clusters, max_iterations=100, saveit=True):
if num_clusters in self._reassigned_clusters:
return self._reassigned_clusters[num_clusters]
self.update_clusters(num_clusters)
new_centroids = self._centroids
clusters = self._dendogram.groups(num_clusters)
for iter in range(max_iterations):
number_reassigned = 0
new_clusters = [[] for i in range(len(self._centroids))]
for cluster_number, cluster in enumerate(clusters):
for vec in cluster:
dps = [numpy.dot(numpy.transpose(centroid), vec) for centroid in new_centroids]
new_cluster_index = dps.index(max(dps))
new_clusters[new_cluster_index].append(vec)
if new_cluster_index != cluster_number:
number_reassigned += 1
new_centroids = []
for cluster in new_clusters:
assert len(cluster) > 0
if self._should_normalise:
centroid = self._normalise(cluster[0])
else:
centroid = numpy.array(cluster[0])
for vector in cluster[1:]:
if self._should_normalise:
centroid += self._normalise(vector)
else:
centroid += vector
# centroid /= float(len(cluster)) # was this supposed to be some sort of normalizing?
norm_centroid = normalize(centroid)
new_centroids.append(norm_centroid)
print [len(cluster) for cluster in new_clusters]
print "Number reassigned = %i" % number_reassigned
def cluster_vectorspace(self, vectors, trace=False):
# create a cluster for each vector
clusters = [[vector] for vector in vectors]
# This copy module and function is from the python standard library
vector_sum = copy.copy(vectors)
norm_sum = [normalize(vsum) for vsum in vector_sum]
cluster_matrix = numpy.zeros([len(vectors[0]), len(vectors)])
i = 0
for v in norm_sum:
cluster_matrix[:, i] = v
i = i + 1
dot_store_matrix = numpy.dot(cluster_matrix.transpose(),
cluster_matrix)
while len(clusters) > max(self._num_clusters, 1):
# find the two best candidate clusters to merge
max_sim = self.array_max(dot_store_matrix)
i = max_sim[0]
j = max_sim[1]
if i == j:
print "got stuck when at " + str(len(clusters)) + " clusters"
break
vsum = clusters[i] + clusters[j]
if trace:
print 'merging %d and %d' % (i, j)
clusters[i] = vsum
del clusters[j]
vector_sum[i] = vector_sum[i] + vector_sum[j]
norm_sum[i] = normalize(vector_sum[i])
cluster_matrix[:, i] = norm_sum[i]
del vector_sum[j]
del norm_sum[j]
cluster_matrix = numpy.delete(cluster_matrix, j, 1)
dot_store_matrix = numpy.dot(cluster_matrix.transpose(),
cluster_matrix)
self._dendogram.merge(i, j)
if self._names:
self._name_dendogram.merge(i, j)
if len(clusters) % 50 == 0:
print len(clusters)
self.update_clusters(len(clusters))
def cluster_vectorspace(self, vectors, trace=False):
# create a cluster for each vector
clusters = [[vector] for vector in vectors]
# This copy module and function is from the python standard library
vector_sum = copy.copy(vectors)
norm_sum = [normalize(vsum) for vsum in vector_sum]
while len(clusters) > max(self._num_clusters, 1):
# find the two best candidate clusters to merge
best = None
for i in range(len(clusters)):
for j in range(i + 1, len(clusters)):
sim = numpy.dot(norm_sum[i], norm_sum[j])
if not best or sim > best[0]:
best = (sim, i, j)
# merge them and replace in cluster list
i, j = best[1:]
csum = clusters[i] + clusters[j]
if trace:
print 'merging %d and %d' % (i, j)
# print len(clusters)
clusters[i] = csum
del clusters[j]
vector_sum[i] = vector_sum[i] + vector_sum[j]
norm_sum[i] = normalize(vector_sum[i])
del vector_sum[j]
del norm_sum[j]
self._dendogram.merge(i, j)
if self._names:
self._name_dendogram.merge(i, j)
if len(clusters) % 50 == 0:
print len(clusters)
self.update_clusters(self._num_clusters)
def cluster_vectorspace(self, vectors, trace=False):
# create a cluster for each vector
clusters = [[vector] for vector in vectors]
# This copy module and function is from the python standard library
vector_sum = copy.copy(vectors)
norm_sum = [normalize(vsum) for vsum in vector_sum]
while len(clusters) > max(self._num_clusters, 1):
# find the two best candidate clusters to merge
best = None
for i in range(len(clusters)):
for j in range(i + 1, len(clusters)):
sim = numpy.dot(norm_sum[i], norm_sum[j])
if not best or sim > best[0]:
best = (sim, i, j)
# merge them and replace in cluster list
i, j = best[1:]
csum = clusters[i] + clusters[j]
if trace:
print 'merging %d and %d' % (i, j)
# print len(clusters)
clusters[i] = csum
del clusters[j]
vector_sum[i] = vector_sum[i] + vector_sum[j]
norm_sum[i] = normalize(vector_sum[i])
del vector_sum[j]
del norm_sum[j]
self._dendogram.merge(i, j)
if self._names:
self._name_dendogram.merge(i, j)
if len(clusters) % 50 == 0:
print len(clusters)
self.update_clusters(self._num_clusters)
def compute_centroids(self, clusters):
centroids = []
for cluster in clusters:
assert len(cluster) > 0
if self._should_normalise:
centroid = self._normalise(cluster[0])
else:
centroid = numpy.array(cluster[0])
for vector in cluster[1:]:
if self._should_normalise:
centroid += self._normalise(vector)
else:
centroid += vector
# centroid /= float(len(cluster)) # was this supposed to be some sort of normalizing?
norm_centroid = normalize(centroid)
centroids.append(norm_centroid)
return centroids
def update_clusters(self, num_clusters):
clusters = self._dendogram.groups(num_clusters)
self._centroids = []
for cluster in clusters:
assert len(cluster) > 0
if self._should_normalise:
centroid = self._normalise(cluster[0])
else:
centroid = numpy.array(cluster[0])
for vector in cluster[1:]:
if self._should_normalise:
centroid += self._normalise(vector)
else:
centroid += vector
# centroid /= float(len(cluster)) # was this supposed to be some sort of normalizing?
norm_centroid = normalize(centroid)
self._centroids.append(norm_centroid)
self._num_clusters = len(self._centroids)
def update_clusters(self, num_clusters):
print "entering update clusters with num_clusters = " + str(
num_clusters)
clusters = self._dendogram.groups(num_clusters)
self._centroids = []
for cluster in clusters:
assert len(cluster) > 0
if self._should_normalise:
centroid = self._normalise(cluster[0])
else:
centroid = numpy.array(cluster[0])
for vector in cluster[1:]:
if self._should_normalise:
centroid += self._normalise(vector)
else:
centroid += vector
# centroid /= float(len(cluster)) # was this supposed to be some sort of normalizing?
norm_centroid = normalize(centroid)
self._centroids.append(norm_centroid)
self._num_clusters = len(self._centroids)
