Open source code for ACL 2020 Paper: Integrating Multimodal Information in Large Pretrained Transformers

1. Configure global_configs.py

   global_configs.py defines global constants such as dimension of each data modality (text, acoustic, visual) and cpu/gpu settings. It also defines which layer MAG will be injected. The following are default configuration.

   os.environ["CUDA_VISIBLE_DEVICES"] = "0"
   os.environ["WANDB_PROGRAM"] = "multimodal_driver.py"
   
   DEVICE = torch.device("cuda:0")
   
   # contextualized text embedding from pre-trained BERT / XLNet
   TEXT_DIM = 768
   # acoustic / visual embedding dimension from MOSI dataset
   ACOUSTIC_DIM = 74
   VISUAL_DIM = 47
   
   XLNET_INJECTION_INDEX = 1
   

2. Training MAG-BERT / MAG-XLNet on MOSI

   First, install python dependancies using pip install -r requirements.txt

   Training scripts:

   • MAG-BERT python mutlimodal_driver.py --model bert-base-uncased
   • MAG-XLNet python multimodal_driver.py --model xlnet-base-cased

   By default, mutlimodal_driver.py will attempt to create a Weights and Biases (W&B) project to log your runs and results. If you wish to disable W&B logging, set environment variable to WANDB_MODE=dryrun.

3. Model usage

   We would like to thank huggingface for providing and open-sourcing BERT / XLNet code for developing our models. Note that bert.py / xlnet.py are based on huggingface's implmentation.

   MAG

   from modeling import MAG
   
   hidden_size, beta_shift, dropout_prob = 768, 1e-3, 0.5
   multimodal_gate = MAG(hidden_size, beta_shift, dropout_prob)
   
   fused_embedding = multimodal_gate(text_embedding, visual_embedding, acoustic_embedding)
   

   MAG-BERT

   from bert import MAG_BertForSequenceClassification
   
   class MultimodalConfig(object):
       def __init__(self, beta_shift, dropout_prob):
           self.beta_shift = beta_shift
           self.dropout_prob = dropout_prob
   
   multimodal_config = MutlimodalConfig(beta_shift=1e-3, dropout_prob=0.5)
   model = MAG_BertForSequenceClassification.from_pretrained(
           'bert-base-uncased', multimodal_config=multimodal_config, num_labels=1,
       )
   
   outputs = model(input_ids, visual, acoustic, attention_mask, position_ids)
   logits = outputs[0]
   

   MAG-XLNet

   from xlnet import MAG_XLNetForSequenceClassification
   
   class MultimodalConfig(object):
       def __init__(self, beta_shift, dropout_prob):
           self.beta_shift = beta_shift
           self.dropout_prob = dropout_prob
   
   multimodal_config = MutlimodalConfig(beta_shift=1e-3, dropout_prob=0.5)
   model = MAG_XLNet_ForSequenceClassification.from_pretrained(
           'xlnet-base-cased', multimodal_config=multimodal_config, num_labels=1,
       )
   
   outputs = model(input_ids, visual, acoustic, attention_mask, position_ids)
   logits = outputs[0]
   

   For MAG-BERT / MAG-XLNet usage, visual, acoustic are torch.FloatTensor of shape (batch_size, sequence_length, modality_dim).

   input_ids, attention_mask, position_ids are torch.LongTensor of shape (batch_size, sequence_length). For more details on how these tensors should be formatted / generated, please refer to multimodal_driver.py's convert_to_features method and huggingface's documentation

• Wasifur Rahman: [email protected]
• Sangwu Lee: [email protected]
• Kamrul Hasan: [email protected]