Fix cache dir (#7)

- Fix default cache dir (5f9eff30d93a85d95c9e138bc009985aacd9ebca)

config.json

@@ -7,7 +7,7 @@
     "AutoConfig": "configuration_cased.CaSEDConfig",
     "AutoModel": "modeling_cased.CaSEDModel"
   },
-  "cache_dir": "~/.cache/cased",
+  "cache_dir": null,
   "index_name": "cc12m",
   "model_type": "cased",
   "retrieval_num_results": 10,

retrieval_cased.py

@@ -18,7 +18,7 @@ RETRIEVAL_DATABASES_URLS = {
 }
 
 
-def download_retrieval_databases(cache_dir: str = "~/.cache/cased"):
+def download_retrieval_databases(cache_dir: str):
     """Download data if needed.
 
     Args:
@@ -94,7 +94,7 @@ class RetrievalDatabase:
         cache_dir (str): Path to cache directory. Defaults to "~/.cache/cased".
     """
 
-    def __init__(self, database_name: str, cache_dir: str = "~/.cache/cased"):
+    def __init__(self, database_name: str, cache_dir: str):
         assert database_name in RETRIEVAL_DATABASES_URLS.keys(), (
             f"Database name should be one of "
             f"{list(RETRIEVAL_DATABASES_URLS.keys())}, got {database_name}."