[SIG] add WikiText-2&103 (#397)

* fix conflict

* add eval_cfg

configs/datasets/wikitext/wikitext_103_raw_ppl.py

+from mmengine.config import read_base
+
+with read_base():
+    from .wikitext_103_raw_ppl_752e2a import wikitext_103_raw_datasets  # noqa: F401, F403

configs/datasets/wikitext/wikitext_103_raw_ppl_752e2a.py

+from opencompass.openicl.icl_prompt_template import PromptTemplate
+from opencompass.openicl.icl_retriever import ZeroRetriever
+from opencompass.openicl.icl_inferencer import GenInferencer
+from opencompass.openicl.icl_evaluator import AccEvaluator
+from opencompass.datasets import HFDataset
+
+
+wikitext_infer_cfg = dict(
+    prompt_template=dict(
+        type=PromptTemplate,
+        template={0: '{text}'}
+    ),
+    retriever=dict(type=ZeroRetriever),
+    inferencer=dict(type=GenInferencer), # need a new ppl inferencer
+)
+
+wikitext_eval_cfg = dict(evaluator=dict(type=AccEvaluator), )
+
+wikitext_103_raw_datasets = []
+for _split in ["validation", "test"]:
+
+    wikitext_reader_cfg = dict(
+        input_columns=["text"],
+        output_column=None,
+        train_split="train",
+        test_split=_split,
+    )
+
+    wikitext_103_raw_datasets.append(
+        dict(
+            abbr=f"wikitext-103-raw-{_split}",
+            type=HFDataset,
+            path="wikitext",
+            name="wikitext-103-raw-v1",
+            reader_cfg=wikitext_reader_cfg,
+            infer_cfg=wikitext_infer_cfg,
+            eval_cfg=wikitext_eval_cfg,
+        )
+    )

configs/datasets/wikitext/wikitext_2_raw_ppl.py

+from mmengine.config import read_base
+
+with read_base():
+    from .wikitext_2_raw_ppl_752e2a import wikitext_2_raw_datasets  # noqa: F401, F403

configs/datasets/wikitext/wikitext_2_raw_ppl_752e2a.py

+from opencompass.openicl.icl_prompt_template import PromptTemplate
+from opencompass.openicl.icl_retriever import ZeroRetriever
+from opencompass.openicl.icl_inferencer import GenInferencer
+from opencompass.openicl.icl_evaluator import AccEvaluator
+from opencompass.datasets import HFDataset
+
+
+wikitext_infer_cfg = dict(
+    prompt_template=dict(
+        type=PromptTemplate,
+        template={0: '{text}'}
+    ),
+    retriever=dict(type=ZeroRetriever),
+    inferencer=dict(type=GenInferencer), # need a new ppl inferencer
+)
+
+wikitext_eval_cfg = dict(evaluator=dict(type=AccEvaluator), )
+
+wikitext_2_raw_datasets = []
+for _split in ["validation", "test"]:
+
+    wikitext_reader_cfg = dict(
+        input_columns=["text"],
+        output_column=None,
+        train_split="train",
+        test_split=_split,
+    )
+
+    wikitext_2_raw_datasets.append(
+        dict(
+            abbr=f"wikitext-2-raw-{_split}",
+            type=HFDataset,
+            path="wikitext",
+            name="wikitext-2-raw-v1",
+            reader_cfg=wikitext_reader_cfg,
+            infer_cfg=wikitext_infer_cfg,
+            eval_cfg=wikitext_eval_cfg,
+        )
+    )