def cache_document_fields_for_doc_ids(_task: ExtendedTask, doc_ids: Set):
for doc in Document.objects.filter(pk__in=doc_ids):
log = CeleryTaskLogger(_task)
field_value_cache.cache_generic_values(doc, log=log)
suggested_values = field_detection.detect_and_cache_field_values_for_document(log, doc, False,
clear_old_values=False)
field_value_cache.cache_field_values(doc, suggested_values, save=True, log=log)
def process(self, **kwargs):
n_clusters = kwargs.get('n_clusters')
method = kwargs.get('method')
project_id = kwargs.get('project_id')
project_clustering_id = kwargs.get('project_clustering_id')
project_clustering = ProjectClustering.objects.get(
pk=project_clustering_id) if project_id else None
project_clustering.task = self.task
project_clustering.save()
project = project_clustering.project
self.log_info(
'Start clustering documents for project id={}'.format(project_id))
self.log_info('Clustering method: "{}", n_clusters={}'.format(
method, n_clusters))
self.set_push_steps(4)
# get documents data
documents = Document.objects.filter(project_id=project_id)
id_name_map = {k: v for k, v in documents.values_list('id', 'name')}
docs_count = len(id_name_map)
# cluster by full text
if kwargs.get('cluster_by') == 'full_text':
docs = np.array(documents.values_list('pk', 'full_text'))
pks, data = docs[:, 0], docs[:, 1]
# try increase min_df if exception occurs while fit_trasform
for max_df in range(50, 101, 5):
max_df = float(max_df / 100)
try:
vectorizer = TfidfVectorizer(max_df=max_df,
max_features=100,
min_df=2,
stop_words='english',
use_idf=True)
X = vectorizer.fit_transform(data)
except ValueError as e:
if 'Try a lower min_df or a higher max_df' in str(e):
continue
else:
raise e
break
terms = vectorizer.get_feature_names()
# Cluster by terms
else:
id_field = 'id'
prop_field = 'textunit__termusage__term__term'
# filter non-null, null
qs = documents.filter(textunit__termusage__isnull=False)
if not qs.exists():
raise RuntimeError(
'No terms in documents detected, try to re-run terms parser.'
)
# get values
ann_cond = dict(prop_count=Count(prop_field))
qs = qs.values(id_field,
prop_field).annotate(**ann_cond).distinct()
# get data
df = pd.DataFrame(list(qs)).dropna()
null_qs = documents.exclude(textunit__termusage__isnull=False)
if null_qs.exists():
null_df = pd.DataFrame(list(
null_qs.values('id'))).set_index('id')
df = df.join(null_df, how='outer', on='id')
df = df.pivot(index=id_field,
columns=prop_field,
values='prop_count').fillna(0)
X = df.as_matrix()
# convert CountVec into TFvec
tf_transformer = TfidfTransformer(use_idf=False).fit(X)
X = tf_transformer.transform(X)
pks = df.index.tolist()
terms = df.columns.tolist()
if method == 'Birch':
m = Birch(n_clusters=n_clusters,
threshold=0.5,
branching_factor=50)
elif method == 'MiniBatchKMeans':
m = MiniBatchKMeans(n_clusters=n_clusters,
init='k-means++',
n_init=1,
init_size=100,
batch_size=100,
verbose=False)
else:
method = 'KMeans'
m = KMeans(n_clusters=n_clusters,
init='k-means++',
max_iter=100,
n_init=1,
verbose=False)
m.fit(X)
self.push()
X = X.toarray()
pca = PCA(n_components=2).fit(X)
data2d = pca.transform(X)
if method == 'DBSCAN':
clusters = m.labels_
cluster_labels = set(clusters)
# reshape cluster labels
if -1 in cluster_labels:
cluster_labels = [i + 1 for i in cluster_labels]
cluster_terms = cluster_labels
centers2d = None
else:
if method == 'Birch':
cluster_centers = m.subcluster_centers_
else:
cluster_centers = m.cluster_centers_
order_centroids = cluster_centers.argsort()[:, ::-1]
clusters = m.labels_.tolist()
cluster_labels = set(clusters)
_n_clusters = len(cluster_labels)
cluster_terms = [[terms[ind] for ind in order_centroids[i, :10]]
for i in range(_n_clusters)]
centers2d = pca.transform(cluster_centers)
points_data = [{
'document_id': pks[i],
'document_name': id_name_map[pks[i]],
'coord': data2d[i].tolist(),
'cluster_id': str(clusters[i])
} for i in range(docs_count)]
self.push()
clusters_data = {}
created_date = now()
for cluster_id in cluster_labels:
cluster_label = cluster_terms[cluster_id]
if isinstance(cluster_label, list):
cluster_label = '-'.join(cluster_label[:5])
cluster = DocumentCluster.objects.create(
cluster_id=cluster_id,
name='Default({})'.format(project.pk if project else None),
self_name=cluster_label,
description=
'Cluster Project (id={}) with Multiple Contract Types'.format(
project_id),
cluster_by='all',
using=method,
created_date=created_date)
cluster_documents = [
i['document_id'] for i in points_data
if i['cluster_id'] == str(cluster_id)
]
cluster.documents.set(cluster_documents)
clusters_data[str(cluster_id)] = dict(
cluster_obj_id=cluster.pk,
cluster_terms=cluster_terms[cluster_id],
centroid_coord=centers2d[cluster_id].tolist()
if centers2d is not None else None)
project_clustering.document_clusters.add(cluster)
result = {
'method': method,
'n_clusters': n_clusters,
'points_data': points_data,
'clusters_data': clusters_data
}
project_clustering.metadata = result
project_clustering.save()
self.push()
self.log_info('Clustering completed. Updating document cache.')
for doc in Document.objects.filter(project__pk=project_id):
field_value_cache.cache_generic_values(doc)
self.push()
self.log_info('Finished.')
return result
