diff --git a/clip_eval/dataset/base.py b/clip_eval/dataset/base.py
index 9275d6b..a0cd918 100644
--- a/clip_eval/dataset/base.py
+++ b/clip_eval/dataset/base.py
@@ -1,11 +1,16 @@
 from abc import ABC, abstractmethod
 from enum import StrEnum, auto
+from os.path import relpath
 from pathlib import Path
 
 from pydantic import BaseModel, ConfigDict
 from torch.utils.data import Dataset as TorchDataset
 
-from clip_eval.constants import CACHE_PATH
+from clip_eval.constants import CACHE_PATH, SOURCES_PATH
+
+DEFAULT_DATASET_TYPES_LOCATION = (
+    Path(relpath(str(__file__), SOURCES_PATH.DATASET_INSTANCE_DEFINITIONS)).parent / "types" / "__init__.py"
+)
 
 
 class Split(StrEnum):
@@ -18,7 +23,7 @@ class Split(StrEnum):
 class DatasetDefinitionSpec(BaseModel):
     dataset_type: str
     title: str
-    module_path: Path = Path(__file__).parent / "types" / "__init__.py"
+    module_path: Path = DEFAULT_DATASET_TYPES_LOCATION
     split: Split | None = None
     title_in_source: str | None = None
     cache_dir: Path | None = None
diff --git a/clip_eval/model/base.py b/clip_eval/model/base.py
index b61d11a..2fc7e67 100644
--- a/clip_eval/model/base.py
+++ b/clip_eval/model/base.py
@@ -1,5 +1,6 @@
 from abc import ABC, abstractmethod
 from collections.abc import Callable
+from os.path import relpath
 from pathlib import Path
 from typing import Any
 
@@ -8,13 +9,17 @@
 from torch.utils.data import DataLoader
 
 from clip_eval.common.numpy_types import ClassArray, EmbeddingArray
-from clip_eval.constants import CACHE_PATH
+from clip_eval.constants import CACHE_PATH, SOURCES_PATH
+
+DEFAULT_MODEL_TYPES_LOCATION = (
+    Path(relpath(str(__file__), SOURCES_PATH.MODEL_INSTANCE_DEFINITIONS)).parent / "types" / "__init__.py"
+)
 
 
 class ModelDefinitionSpec(BaseModel):
     model_type: str
     title: str
-    module_path: Path = Path(__file__).parent / "types" / "__init__.py"
+    module_path: Path = DEFAULT_MODEL_TYPES_LOCATION
     device: str | None = None
     title_in_source: str | None = None
     cache_dir: Path | None = None
diff --git a/sources/dataset-definition-schema.json b/sources/dataset-definition-schema.json
index faa98c2..dcda309 100644
--- a/sources/dataset-definition-schema.json
+++ b/sources/dataset-definition-schema.json
@@ -17,22 +17,26 @@
       "title": "Dataset Type",
       "type": "string"
     },
+    "title": {
+      "title": "Title",
+      "type": "string"
+    },
     "module_path": {
+      "default": "../../clip_eval/dataset/types/__init__.py",
       "format": "path",
       "title": "Module Path",
       "type": "string"
     },
-    "title": {
-      "title": "Title",
-      "type": "string"
-    },
     "split": {
-      "allOf": [
+      "anyOf": [
         {
           "$ref": "#/$defs/Split"
+        },
+        {
+          "type": "null"
         }
       ],
-      "default": "all"
+      "default": null
     },
     "title_in_source": {
       "anyOf": [
@@ -62,7 +66,6 @@
   },
   "required": [
     "dataset_type",
-    "module_path",
     "title"
   ],
   "title": "DatasetDefinitionSpec",
diff --git a/sources/model-definition-schema.json b/sources/model-definition-schema.json
index 40aa14e..6d7abd4 100644
--- a/sources/model-definition-schema.json
+++ b/sources/model-definition-schema.json
@@ -5,15 +5,16 @@
       "title": "Model Type",
       "type": "string"
     },
+    "title": {
+      "title": "Title",
+      "type": "string"
+    },
     "module_path": {
+      "default": "../../clip_eval/model/types/__init__.py",
       "format": "path",
       "title": "Module Path",
       "type": "string"
     },
-    "title": {
-      "title": "Title",
-      "type": "string"
-    },
     "device": {
       "anyOf": [
         {
@@ -54,7 +55,6 @@
   },
   "required": [
     "model_type",
-    "module_path",
     "title"
   ],
   "title": "ModelDefinitionSpec",