GPT: Weights not being initialized
Hello covid-19 survivors,

I have been trying to use GPT for token classification, however currently there is none from hugging face, hence I copied your code from berttokenclassification and stitched the below code. But it says all the weights not initialized. Did I make a mistake, please help me!!!

`
class GPTClassifier(OpenAIGPTPreTrainedModel):
    def __init__(self, config):
        super().__init__(config)
        self.num_labels = 2

        self.gpt = OpenAIGPTModel(config)
        self.dropout = nn.Dropout(0.1)
        self.classifier = nn.Linear(768, 2)

        self.init_weights()

    @add_start_docstrings(
    """GPT Model with a token classification head on top (a linear layer on top of
    the hidden-states output) e.g. for Named-Entity-Recognition (NER) tasks. """,
    )
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        token_type_ids=None,
        position_ids=None,
        head_mask=None,
        inputs_embeds=None,
        labels=None,
    ):
        outputs = self.gpt(
            input_ids,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
        )

        sequence_output = outputs[0]

        sequence_output = self.dropout(sequence_output)
        logits = self.classifier(sequence_output)

        outputs = (logits,) + outputs[2:]  # add hidden states and attention if they are here
        if labels is not None:
            loss_fct = CrossEntropyLoss()
            # Only keep active parts of the loss
            if attention_mask is not None:
                active_loss = attention_mask.view(-1) == 1
                active_logits = logits.view(-1, self.num_labels)
                active_labels = torch.where(
                    active_loss, labels.view(-1), torch.tensor(loss_fct.ignore_index).type_as(labels)
                )
                loss = loss_fct(active_logits, active_labels)
            else:
                loss = loss_fct(logits.view(-1, self.num_labels), labels.view(-1))
            outputs = (loss,) + outputs

        return outputs  # (loss), scores, (hidden_states), (attentions)
`

weights not initalized: 
`Weights of GPTClassifier not initialized from pretrained model: ['gpt.tokens_embed.weight', 'gpt.positions_embed.weight', 'gpt.h.0.attn.bias', 'gpt.h.0.attn.c_attn.weight', 'gpt.h.0.attn.c_attn.bias', 'gpt.h.0.attn.c_proj.weight', 'gpt.h.0.attn.c_proj.bias', 'gpt.h.0.ln_1.weight', 'gpt.h.0.ln_1.bias', 'gpt.h.0.mlp.c_fc.weight', 'gpt.h.0.mlp.c_fc.bias', 'gpt.h.0.mlp.c_proj.weight', 'gpt.h.0.mlp.c_proj.bias', 'gpt.h.0.ln_2.weight', 'gpt.h.0.ln_2.bias', 'gpt.h.1.attn.bias', 'gpt.h.1.attn.c_attn.weight', 'gpt.h.1.attn.c_attn.bias', 'gpt.h.1.attn.c_proj.weight', 'gpt.h.1.attn.c_proj.bias', 'gpt.h.1.ln_1.weight', 'gpt.h.1.ln_1.bias', 'gpt.h.1.mlp.c_fc.weight', 'gpt.h.1.mlp.c_fc.bias', 'gpt.h.1.mlp.c_proj.weight', 'gpt.h.1.mlp.c_proj.bias', 'gpt.h.1.ln_2.weight', 'gpt.h.1.ln_2.bias', 'gpt.h.2.attn.bias', 'gpt.h.2.attn.c_attn.weight', 'gpt.h.2.attn.c_attn.bias', 'gpt.h.2.attn.c_proj.weight', 'gpt.h.2.attn.c_proj.bias', 'gpt.h.2.ln_1.weight', 'gpt.h.2.ln_1.bias', 'gpt.h.2.mlp.c_fc.weight', 'gpt.h.2.mlp.c_fc.bias', 'gpt.h.2.mlp.c_proj.weight', 'gpt.h.2.mlp.c_proj.bias', 'gpt.h.2.ln_2.weight', 'gpt.h.2.ln_2.bias', 'gpt.h.3.attn.bias', 'gpt.h.3.attn.c_attn.weight', 'gpt.h.3.attn.c_attn.bias', 'gpt.h.3.attn.c_proj.weight', 'gpt.h.3.attn.c_proj.bias', 'gpt.h.3.ln_1.weight', 'gpt.h.3.ln_1.bias', 'gpt.h.3.mlp.c_fc.weight', 'gpt.h.3.mlp.c_fc.bias', 'gpt.h.3.mlp.c_proj.weight', 'gpt.h.3.mlp.c_proj.bias', 'gpt.h.3.ln_2.weight', 'gpt.h.3.ln_2.bias', 'gpt.h.4.attn.bias', 'gpt.h.4.attn.c_attn.weight', 'gpt.h.4.attn.c_attn.bias', 'gpt.h.4.attn.c_proj.weight', 'gpt.h.4.attn.c_proj.bias', 'gpt.h.4.ln_1.weight', 'gpt.h.4.ln_1.bias', 'gpt.h.4.mlp.c_fc.weight', 'gpt.h.4.mlp.c_fc.bias', 'gpt.h.4.mlp.c_proj.weight', 'gpt.h.4.mlp.c_proj.bias', 'gpt.h.4.ln_2.weight', 'gpt.h.4.ln_2.bias', 'gpt.h.5.attn.bias', 'gpt.h.5.attn.c_attn.weight', 'gpt.h.5.attn.c_attn.bias', 'gpt.h.5.attn.c_proj.weight', 'gpt.h.5.attn.c_proj.bias', 'gpt.h.5.ln_1.weight', 'gpt.h.5.ln_1.bias', 'gpt.h.5.mlp.c_fc.weight', 'gpt.h.5.mlp.c_fc.bias', 'gpt.h.5.mlp.c_proj.weight', 'gpt.h.5.mlp.c_proj.bias', 'gpt.h.5.ln_2.weight', 'gpt.h.5.ln_2.bias', 'gpt.h.6.attn.bias', 'gpt.h.6.attn.c_attn.weight', 'gpt.h.6.attn.c_attn.bias', 'gpt.h.6.attn.c_proj.weight', 'gpt.h.6.attn.c_proj.bias', 'gpt.h.6.ln_1.weight', 'gpt.h.6.ln_1.bias', 'gpt.h.6.mlp.c_fc.weight', 'gpt.h.6.mlp.c_fc.bias', 'gpt.h.6.mlp.c_proj.weight', 'gpt.h.6.mlp.c_proj.bias', 'gpt.h.6.ln_2.weight', 'gpt.h.6.ln_2.bias', 'gpt.h.7.attn.bias', 'gpt.h.7.attn.c_attn.weight', 'gpt.h.7.attn.c_attn.bias', 'gpt.h.7.attn.c_proj.weight', 'gpt.h.7.attn.c_proj.bias', 'gpt.h.7.ln_1.weight', 'gpt.h.7.ln_1.bias', 'gpt.h.7.mlp.c_fc.weight', 'gpt.h.7.mlp.c_fc.bias', 'gpt.h.7.mlp.c_proj.weight', 'gpt.h.7.mlp.c_proj.bias', 'gpt.h.7.ln_2.weight', 'gpt.h.7.ln_2.bias', 'gpt.h.8.attn.bias', 'gpt.h.8.attn.c_attn.weight', 'gpt.h.8.attn.c_attn.bias', 'gpt.h.8.attn.c_proj.weight', 'gpt.h.8.attn.c_proj.bias', 'gpt.h.8.ln_1.weight', 'gpt.h.8.ln_1.bias', 'gpt.h.8.mlp.c_fc.weight', 'gpt.h.8.mlp.c_fc.bias', 'gpt.h.8.mlp.c_proj.weight', 'gpt.h.8.mlp.c_proj.bias', 'gpt.h.8.ln_2.weight', 'gpt.h.8.ln_2.bias', 'gpt.h.9.attn.bias', 'gpt.h.9.attn.c_attn.weight', 'gpt.h.9.attn.c_attn.bias', 'gpt.h.9.attn.c_proj.weight', 'gpt.h.9.attn.c_proj.bias', 'gpt.h.9.ln_1.weight', 'gpt.h.9.ln_1.bias', 'gpt.h.9.mlp.c_fc.weight', 'gpt.h.9.mlp.c_fc.bias', 'gpt.h.9.mlp.c_proj.weight', 'gpt.h.9.mlp.c_proj.bias', 'gpt.h.9.ln_2.weight', 'gpt.h.9.ln_2.bias', 'gpt.h.10.attn.bias', 'gpt.h.10.attn.c_attn.weight', 'gpt.h.10.attn.c_attn.bias', 'gpt.h.10.attn.c_proj.weight', 'gpt.h.10.attn.c_proj.bias', 'gpt.h.10.ln_1.weight', 'gpt.h.10.ln_1.bias', 'gpt.h.10.mlp.c_fc.weight', 'gpt.h.10.mlp.c_fc.bias', 'gpt.h.10.mlp.c_proj.weight', 'gpt.h.10.mlp.c_proj.bias', 'gpt.h.10.ln_2.weight', 'gpt.h.10.ln_2.bias', 'gpt.h.11.attn.bias', 'gpt.h.11.attn.c_attn.weight', 'gpt.h.11.attn.c_attn.bias', 'gpt.h.11.attn.c_proj.weight', 'gpt.h.11.attn.c_proj.bias', 'gpt.h.11.ln_1.weight', 'gpt.h.11.ln_1.bias', 'gpt.h.11.mlp.c_fc.weight', 'gpt.h.11.mlp.c_fc.bias', 'gpt.h.11.mlp.c_proj.weight', 'gpt.h.11.mlp.c_proj.bias', 'gpt.h.11.ln_2.weight', 'gpt.h.11.ln_2.bias', 'classifier.weight', 'classifier.bias']
I0612 13:58:30.055731 4472821184 modeling_utils.py:460] Weights from pretrained model not used in GPTClassifier: ['tokens_embed.weight', 'positions_embed.weight', 'h.0.attn.bias', 'h.0.attn.c_attn.weight', 'h.0.attn.c_attn.bias', 'h.0.attn.c_proj.weight', 'h.0.attn.c_proj.bias', 'h.0.ln_1.weight', 'h.0.ln_1.bias', 'h.0.mlp.c_fc.weight', 'h.0.mlp.c_fc.bias', 'h.0.mlp.c_proj.weight', 'h.0.mlp.c_proj.bias', 'h.0.ln_2.weight', 'h.0.ln_2.bias', 'h.1.attn.bias', 'h.1.attn.c_attn.weight', 'h.1.attn.c_attn.bias', 'h.1.attn.c_proj.weight', 'h.1.attn.c_proj.bias', 'h.1.ln_1.weight', 'h.1.ln_1.bias', 'h.1.mlp.c_fc.weight', 'h.1.mlp.c_fc.bias', 'h.1.mlp.c_proj.weight', 'h.1.mlp.c_proj.bias', 'h.1.ln_2.weight', 'h.1.ln_2.bias', 'h.2.attn.bias', 'h.2.attn.c_attn.weight', 'h.2.attn.c_attn.bias', 'h.2.attn.c_proj.weight', 'h.2.attn.c_proj.bias', 'h.2.ln_1.weight', 'h.2.ln_1.bias', 'h.2.mlp.c_fc.weight', 'h.2.mlp.c_fc.bias', 'h.2.mlp.c_proj.weight', 'h.2.mlp.c_proj.bias', 'h.2.ln_2.weight', 'h.2.ln_2.bias', 'h.3.attn.bias', 'h.3.attn.c_attn.weight', 'h.3.attn.c_attn.bias', 'h.3.attn.c_proj.weight', 'h.3.attn.c_proj.bias', 'h.3.ln_1.weight', 'h.3.ln_1.bias', 'h.3.mlp.c_fc.weight', 'h.3.mlp.c_fc.bias', 'h.3.mlp.c_proj.weight', 'h.3.mlp.c_proj.bias', 'h.3.ln_2.weight', 'h.3.ln_2.bias', 'h.4.attn.bias', 'h.4.attn.c_attn.weight', 'h.4.attn.c_attn.bias', 'h.4.attn.c_proj.weight', 'h.4.attn.c_proj.bias', 'h.4.ln_1.weight', 'h.4.ln_1.bias', 'h.4.mlp.c_fc.weight', 'h.4.mlp.c_fc.bias', 'h.4.mlp.c_proj.weight', 'h.4.mlp.c_proj.bias', 'h.4.ln_2.weight', 'h.4.ln_2.bias', 'h.5.attn.bias', 'h.5.attn.c_attn.weight', 'h.5.attn.c_attn.bias', 'h.5.attn.c_proj.weight', 'h.5.attn.c_proj.bias', 'h.5.ln_1.weight', 'h.5.ln_1.bias', 'h.5.mlp.c_fc.weight', 'h.5.mlp.c_fc.bias', 'h.5.mlp.c_proj.weight', 'h.5.mlp.c_proj.bias', 'h.5.ln_2.weight', 'h.5.ln_2.bias', 'h.6.attn.bias', 'h.6.attn.c_attn.weight', 'h.6.attn.c_attn.bias', 'h.6.attn.c_proj.weight', 'h.6.attn.c_proj.bias', 'h.6.ln_1.weight', 'h.6.ln_1.bias', 'h.6.mlp.c_fc.weight', 'h.6.mlp.c_fc.bias', 'h.6.mlp.c_proj.weight', 'h.6.mlp.c_proj.bias', 'h.6.ln_2.weight', 'h.6.ln_2.bias', 'h.7.attn.bias', 'h.7.attn.c_attn.weight', 'h.7.attn.c_attn.bias', 'h.7.attn.c_proj.weight', 'h.7.attn.c_proj.bias', 'h.7.ln_1.weight', 'h.7.ln_1.bias', 'h.7.mlp.c_fc.weight', 'h.7.mlp.c_fc.bias', 'h.7.mlp.c_proj.weight', 'h.7.mlp.c_proj.bias', 'h.7.ln_2.weight', 'h.7.ln_2.bias', 'h.8.attn.bias', 'h.8.attn.c_attn.weight', 'h.8.attn.c_attn.bias', 'h.8.attn.c_proj.weight', 'h.8.attn.c_proj.bias', 'h.8.ln_1.weight', 'h.8.ln_1.bias', 'h.8.mlp.c_fc.weight', 'h.8.mlp.c_fc.bias', 'h.8.mlp.c_proj.weight', 'h.8.mlp.c_proj.bias', 'h.8.ln_2.weight', 'h.8.ln_2.bias', 'h.9.attn.bias', 'h.9.attn.c_attn.weight', 'h.9.attn.c_attn.bias', 'h.9.attn.c_proj.weight', 'h.9.attn.c_proj.bias', 'h.9.ln_1.weight', 'h.9.ln_1.bias', 'h.9.mlp.c_fc.weight', 'h.9.mlp.c_fc.bias', 'h.9.mlp.c_proj.weight', 'h.9.mlp.c_proj.bias', 'h.9.ln_2.weight', 'h.9.ln_2.bias', 'h.10.attn.bias', 'h.10.attn.c_attn.weight', 'h.10.attn.c_attn.bias', 'h.10.attn.c_proj.weight', 'h.10.attn.c_proj.bias', 'h.10.ln_1.weight', 'h.10.ln_1.bias', 'h.10.mlp.c_fc.weight', 'h.10.mlp.c_fc.bias', 'h.10.mlp.c_proj.weight', 'h.10.mlp.c_proj.bias', 'h.10.ln_2.weight', 'h.10.ln_2.bias', 'h.11.attn.bias', 'h.11.attn.c_attn.weight', 'h.11.attn.c_attn.bias', 'h.11.attn.c_proj.weight', 'h.11.attn.c_proj.bias', 'h.11.ln_1.weight', 'h.11.ln_1.bias', 'h.11.mlp.c_fc.weight', 'h.11.mlp.c_fc.bias', 'h.11.mlp.c_proj.weight', 'h.11.mlp.c_proj.bias', 'h.11.ln_2.weight', 'h.11.ln_2.bias']`

Never mind, resolved now!!
Thanks!! <|||||>How did you resolve?