class CoruscantModel:
type_pretrained = None
data_root = None
list_files = None
model_dir = None
tokenizer_pretrained_coruscant = None
coruscant_vocab = None
coruscant_tokenizer = None
# data bunch
data_bunch = None
batch_size = None
# data to feed the model
train = None
test = None
val = None
# model
bert_model_class = None
loss_func = None
acc_02 = None
model = None
learner = None
# constants
label_cols = None
text_cols = None
# init constructor
def __init__(self,
type_pretrained='BERT',
text_cols="comment_text",
list_files=["train.csv", "test.csv"],
label_cols=[
"toxic", "severe_toxic", "obscene", "threat", "insult",
"identity_hate"
],
data_root=Path("..") / "api/app/dataset/jigsaw",
model_dir='model',
batch_size=12):
self.data_root = data_root
self.model_dir = model_dir
self.batch_size = batch_size
self.label_cols = label_cols
self.text_cols = text_cols
self.list_files = list_files
self.type_pretrained = type_pretrained
gc.collect()
log.debug('type_pretrained: ' + type_pretrained)
if self.type_pretrained == 'BERT':
self.tokenizer_pretrained_coruscant = BertTokenizer.from_pretrained(
"bert-base-uncased")
def make_model(self):
log.debug('----- set_train_val_data ------')
self.set_train_val_data()
log.debug('----- set_vocab_tokenizer ------')
self.set_vocab_tokenizer()
log.debug('----- set_data_bunch ------')
self.set_data_bunch()
log.debug('----- create_model ------')
self.create_model()
log.debug('----- train_and_save ------')
self.train_save()
def set_data_bunch(self):
self.data_bunch = TextDataBunch.from_df(
".",
self.train,
self.val,
tokenizer=self.coruscant_tokenizer,
vocab=self.coruscant_vocab,
include_bos=False,
include_eos=False,
text_cols=self.text_cols,
label_cols=self.label_cols,
bs=self.batch_size,
collate_fn=partial(pad_collate, pad_first=False, pad_idx=0),
)
def set_train_val_data(self):
self.train, self.test = [
pd.read_csv(self.data_root / fname) for fname in self.list_files
]
self.train, self.val = train_test_split(self.train,
shuffle=True,
test_size=0.2,
random_state=42)
# log.info(self.train.head())
def set_vocab_tokenizer(self):
# In following code snippets, we need to wrap BERT vocab and BERT tokenizer with Fastai modules
self.coruscant_vocab = Vocab(
list(self.tokenizer_pretrained_coruscant.vocab.keys()))
self.coruscant_tokenizer = Tokenizer(tok_func=FastAiBertTokenizer(
self.tokenizer_pretrained_coruscant, max_seq_len=256),
pre_rules=[],
post_rules=[])
def create_model(self):
# BERT model
bert_model_class = BertForSequenceClassification.from_pretrained(
'bert-base-uncased', num_labels=6)
# Loss function to be used is Binary Cross Entropy with Logistic Losses
loss_func = nn.BCEWithLogitsLoss()
# Considering this is a multi-label classification problem, we cant use simple accuracy as metrics here.
# we will use accuracy_thresh with threshold of 25% as our metric here.
acc_02 = partial(accuracy_thresh, thresh=0.25)
self.model = bert_model_class
# learner function
self.learner = Learner(self.data_bunch,
self.model,
loss_func=loss_func,
model_dir=self.model_dir,
metrics=acc_02)
def train_save(self):
x = bert_clas_split(self.model)
# Let's split the model now in 6 parts
self.learner.split([x[0], x[1], x[2], x[3], x[5]])
self.learner.lr_find()
self.learner.fit_one_cycle(2,
max_lr=slice(1e-5, 5e-4),
moms=(0.8, 0.7),
pct_start=0.2,
wd=(1e-7, 1e-5, 1e-4, 1e-3, 1e-2))
self.learner.save(self.type_pretrained + '_first')
self.learner.load(self.type_pretrained + '_first')
# Now, we will unfreeze last two last layers and train the model again
self.learner.freeze_to(-2)
self.learner.fit_one_cycle(2,
max_lr=slice(1e-5, 5e-4),
moms=(0.8, 0.7),
pct_start=0.2,
wd=(1e-7, 1e-5, 1e-4, 1e-3, 1e-2))
self.learner.save(self.type_pretrained + '_final')
self.learner.load(self.type_pretrained + '_final')
# We will now unfreeze the entire model and train it
self.learner.unfreeze()
self.learner.lr_find()
self.learner.fit_one_cycle(2,
slice(5e-6, 5e-5),
moms=(0.8, 0.7),
pct_start=0.2,
wd=(1e-7, 1e-5, 1e-4, 1e-3, 1e-2))
def test_prediction(self):
# We will now see our model's prediction power
text = 'you are so sweet'
log.info(text)
log.info(self.learner.predict(text))
text = 'you are pathetic piece of shit'
log.info(text)
log.info(self.learner.predict(text))
text = "what’s so great about return of the jedi? the special effects are abysmal, and the acting is " \
"horrible. it’s like they phoned it in. it’s a mess."
log.info(text)
log.info(self.learner.predict(text))
text = "i hate myself for being too human. how do i liberate my soul ?"
log.info(text)
log.info(self.learner.predict(text))
text = "why was guru arjun singh killed by jahangir?"
log.info(text)
log.info(self.learner.predict(text))
text = "funny how the person that bullies you in elementary is ugly as f**k in high school, and your high " \
"school bull1, a loser in college..."
log.info(text)
log.info(self.learner.predict(text))
text = "stop making fun of amy winehouse and michael jackso2, #rickcastellano is a bully."
log.info(text)
log.info(self.learner.predict(text))
#making model
arch = 'efficientnet-b0'
model_name = f'{arch}-v1'
# Parameters for the entire model (stem, all blocks, and head)
md_ef = EfficientNet.from_pretrained(arch, num_classes=1, dropout_rate=0.5)
# md_ef = resnet50(pretrained=False, num_classes=1)
learn = Learner(data, md_ef, opt_func=optar,
metrics = [accuracy_thresh],
model_dir='fastai-class1').to_fp16()
learn.path = Path(DATA_BASE_PATH)
# First
learn.unfreeze()
learn.fit_one_cycle(10, max_lr=1e-2)
learn.save(f'{model_name}')
# First
learn.unfreeze()
learn.fit_one_cycle(10, max_lr=1e-3)
learn.save(f'{model_name}-stage2')
# First
learn.unfreeze()
learn.fit_one_cycle(10, max_lr=1e-3)
learn.save(f'{model_name}-stage3')