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import logging
logger = logging.getLogger(__name__)
class Instance():
""" `Instance` is the collection of multiple `Field`
"""
def __init__(self, fields):
"""This function initializes instance
Arguments:
fields {list} -- field list
"""
self.fields = list(fields)
self.instance = {}
for field in self.fields:
self.instance[field.namespace] = []
self.vocab_dict = {}
self.vocab_index()
def __getitem__(self, namespace):
if namespace not in self.instance:
logger.error("can not find the namespace {} in instance.".format(namespace))
raise RuntimeError("can not find the namespace {} in instance.".format(namespace))
else:
self.instance.get(namespace, None)
def __iter__(self):
return iter(self.fields)
def __len__(self):
return len(self.fields)
def add_fields(self, fields):
"""This function adds fields to instance
Arguments:
field {Field} -- field list
"""
for field in fields:
if field.namesapce not in self.instance:
self.fields.append(field)
self.instance[field.namesapce] = []
else:
logger.warning('Field {} has been added before.'.format(field.name))
self.vocab_index()
def count_vocab_items(self, counter, sentences):
"""This funtion constructs multiple namespace in counter
Arguments:
counter {dict} -- counter
sentences {list} -- text content after preprocessing
"""
for field in self.fields:
field.count_vocab_items(counter, sentences)
def index(self, vocab, sentences):
"""This funtion indexes token using vocabulary,
then update instance
Arguments:
vocab {Vocabulary} -- vocabulary
sentences {list} -- text content after preprocessing
"""
for field in self.fields:
field.index(self.instance, vocab, sentences)
def get_instance(self):
"""This function get instance
Returns:
dict -- instance
"""
return self.instance
def get_size(self):
"""This funtion gets the size of instance
Returns:
int -- instance size
"""
return len(self.instance[self.fields[0].namespace])
def vocab_index(self):
"""This function constructs vocabulary dict of fields
"""
for field in self.fields:
if hasattr(field, 'vocab_namespace'):
self.vocab_dict[field.namespace] = field.vocab_namespace
def get_vocab_dict(self):
"""This function gets the vocab dict of instance
Returns:
dict -- vocab dict
"""
return self.vocab_dict
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