README.md

---
license: cc-by-sa-4.0
datasets:
- unicamp-dl/mmarco
language:
- ja
---

We initialize SPLADE-japanese from [tohoku-nlp/bert-base-japanese-v2](https://huggingface.co/tohoku-nlp/bert-base-japanese-v2).
This model is trained on [mMARCO](https://github.com/unicamp-dl/mMARCO) Japanese dataset.

```python
from transformers import AutoModelForMaskedLM,AutoTokenizer
import torch
import numpy as np

model = AutoModelForMaskedLM.from_pretrained("aken12/splade-japanese") 
tokenizer = AutoTokenizer.from_pretrained("aken12/splade-japanese")

query = "筑波大学では何の研究が行われているか？"

def encode_query(query, tokenizer, model):
    encoded_input = tokenizer(query, return_tensors="pt")
    with torch.no_grad():
        output = model(**encoded_input, return_dict=True).logits
    aggregated_output, _ = torch.max(torch.log(1 + torch.relu(output)) * encoded_input['attention_mask'].unsqueeze(-1), dim=1)
    return aggregated_output

def get_topk_tokens(reps, vocab_dict, topk):
    topk_values, topk_indices = torch.topk(reps, topk, dim=1)
    values = np.rint(topk_values.numpy() * 100).astype(int)
    dict_splade = {vocab_dict[id_token.item()]: int(value_token) for id_token, value_token in zip(topk_indices[0], values[0]) if value_token > 0}
    return dict_splade


vocab_dict = {v: k for k, v in tokenizer.get_vocab().items()}
topk = len(vocab_dict) // 1000 


model_output = encode_query(query, tokenizer, model)


dict_splade = get_topk_tokens(model_output, vocab_dict, topk)


for token, value in dict_splade.items():
    print(token, value)
```

## output
```
に 250
が 248
は 247
の 247
、 244
と 240
を 239
。 239
も 238
で 237
から 221
や 219
な 206
筑波 204
( 204
・ 202
て 197
へ 191
にて 189
など 188
) 186
まで 184
た 182
この 171
- 170
「 170
より 166
その 165
: 163
」 161
```