exllama requires that pad_token_id be specified in config.json

Hi

@TheBloke

,

exllama crashes unless `pad_token_id` is set in config.json: https://github.com/turboderp/exllama/blob/master/model.py#L52

I have filled in the value of the `[PAD]` token here as per https://huggingface.co/TheBloke/WizardCoder-Guanaco-15B-V1.1-GPTQ/blob/main/special_tokens_map.json#L25

This issue is likely unique to the GPTQ quant but would affect some of the other branches that have exllama support I think.

Thanks as always,
--Mike

config.json

@@ -9,6 +9,7 @@
     "bos_token_id": 0,
     "embd_pdrop": 0.1,
     "eos_token_id": 0,
+    "pad_token_id": 49152,
     "inference_runner": 0,
     "initializer_range": 0.02,
     "layer_norm_epsilon": 1e-05,