[core] Add hub utils

src/peft/mapping.py

@@ -138,4 +138,6 @@ def get_peft_model(model, peft_config):
     else:
         peft_config = _prepare_lora_config(peft_config, model_config)
 
+    peft_config.base_model_name_or_path = model.__dict__.get("name_or_path", None)
+
     return MODEL_TYPE_TO_PEFT_MODEL_MAPPING[peft_config.task_type](model, peft_config)

src/peft/peft_model.py

@@ -14,18 +14,31 @@
 # limitations under the License.
 
 import inspect
+import os
 import warnings
 
 import torch
 from torch.nn import BCEWithLogitsLoss, CrossEntropyLoss, MSELoss
 from transformers import PreTrainedModel
 from transformers.modeling_outputs import SequenceClassifierOutput, TokenClassifierOutput
+from transformers.utils import PushToHubMixin
 
-from .tuners import LoraModel, PrefixEncoder, PromptEmbedding, PromptEncoder
-from .utils import PeftConfig, PeftType, TaskType, _set_trainable, shift_tokens_right
-
+from huggingface_hub import hf_hub_download
 
-class PeftModel(torch.nn.Module):
+from .tuners import LoraModel, PrefixEncoder, PromptEmbedding, PromptEncoder
+from .utils import (
+    WEIGHTS_NAME,
+    PeftConfig,
+    PeftType,
+    TaskType,
+    _set_trainable,
+    get_peft_model_state_dict,
+    set_peft_model_state_dict,
+    shift_tokens_right,
+)
+
+
+class PeftModel(PushToHubMixin, torch.nn.Module):
     """
     Parameter-Efficient Fine-Tuning Model. Base model encompassing various Peft methods.
 
@@ -61,6 +74,73 @@ def __init__(self, model, peft_config: PeftConfig):
             self.base_model = LoraModel(peft_config, model)
         self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
 
+    def save_pretrained(self, save_directory, **kwargs):
+        r"""
+        Args:
+        This function saves the adapter model and the adapter configuration files to a directory, so that it can be
+        re-loaded using the `LoraModel.from_pretrained` class method, and also used by the `LoraModel.push_to_hub`
+        method.
+            save_directory (`str`):
+                Directory where the adapter model and configuration files will be saved (will be created if it does not
+                exist).
+            **kwargs:
+                Additional keyword arguments passed along to the `push_to_hub` method.
+        """
+        if os.path.isfile(save_directory):
+            raise ValueError(f"Provided path ({save_directory}) should be a directory, not a file")
+        os.makedirs(save_directory, exist_ok=True)
+
+        # save the config
+        if self.peft_config.base_model_name_or_path is None:
+            self.peft_config.base_model_name_or_path = self.base_model.__dict__.get("name_or_path", None)
+        self.peft_config.inference_mode = True
+        self.peft_config.save_pretrained(save_directory)
+
+        for param in self.parameters():
+            param.requires_grad = False  # freeze the model
+
+        # save only the trainable weights
+        output_state_dict = get_peft_model_state_dict(self, kwargs.get("state_dict", None))
+        torch.save(output_state_dict, os.path.join(save_directory, WEIGHTS_NAME))
+
+    @classmethod
+    def from_pretrained(cls, model, model_id, **kwargs):
+        r"""
+        Args:
+        Instantiate a `LoraModel` from a pretrained Lora configuration and weights.
+            model (`transformers.PreTrainedModel`):
+                The model to be adapted. The model should be initialized with the `from_pretrained` method. from
+                `transformers` library.
+            model_id (`str`):
+                The name of the Lora configuration to use. Can be either:
+                    - A string, the `model id` of a Lora configuration hosted inside a model repo on
+                        huggingface Hub
+                    - A path to a directory containing a Lora configuration file saved using the
+                        `save_pretrained` method, e.g., ``./my_lora_config_directory/``.
+        """
+        from .mapping import MODEL_TYPE_TO_PEFT_MODEL_MAPPING, PEFT_TYPE_TO_CONFIG_MAPPING
+
+        # load the config
+        config = PEFT_TYPE_TO_CONFIG_MAPPING[PeftConfig.from_pretrained(model_id).peft_type].from_pretrained(model_id)
+
+        model = MODEL_TYPE_TO_PEFT_MODEL_MAPPING[config.task_type](model, config)
+
+        # load weights if any
+        if os.path.exists(os.path.join(model_id, WEIGHTS_NAME)):
+            filename = os.path.join(model_id, WEIGHTS_NAME)
+        else:
+            try:
+                filename = hf_hub_download(model_id, WEIGHTS_NAME)
+            except:  # noqa
+                raise ValueError(
+                    f"Can't find weights for {model_id} in {model_id} or in the Hugging Face Hub. "
+                    f"Please check that the file {WEIGHTS_NAME} is present at {model_id}."
+                )
+
+        adapters_weights = torch.load(filename)
+        # load the weights into the model
+        return set_peft_model_state_dict(model, adapters_weights)
+
     def _setup_prompt_encoder(self):
         num_transformer_submodules = 0
         transformer_backbone = None

src/peft/tuners/lora.py

@@ -12,7 +12,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 import importlib
 import math
 import warnings

src/peft/utils/__init__.py

@@ -17,6 +17,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from .adapters_utils import CONFIG_NAME, WEIGHTS_NAME
 from .config import PeftConfig, PeftType, PromptLearningConfig, TaskType
 from .other import _set_trainable, bloom_model_postprocess_past_key_value, shift_tokens_right, transpose
 from .save_and_load import get_peft_model_state_dict, peft_model_load_and_dispatch, set_peft_model_state_dict

src/peft/utils/adapters_utils.py

@@ -0,0 +1,18 @@
+# coding=utf-8
+# Copyright 2023-present the HuggingFace Inc. team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+WEIGHTS_NAME = "adapter_model.bin"
+CONFIG_NAME = "adapter_config.json"
+
+# TODO: add automapping and superclass here?

src/peft/utils/config.py

@@ -12,11 +12,18 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 import enum
-from dataclasses import dataclass, field
+import json
+import os
+from dataclasses import asdict, dataclass, field
 from typing import Optional, Union
 
+from transformers.utils import PushToHubMixin
+
+from huggingface_hub import hf_hub_download
+
+from .adapters_utils import CONFIG_NAME
+
 
 class PeftType(str, enum.Enum):
     PROMPT_TUNING = "PROMPT_TUNING"
@@ -33,7 +40,94 @@ class TaskType(str, enum.Enum):
 
 
 @dataclass
-class PeftConfig:
+class PeftConfigMixin(PushToHubMixin):
+    r"""
+    This is the base configuration class for PEFT adapter models. It contains all the methods that are common to all
+    PEFT adapter models. This class inherits from `transformers.utils.PushToHubMixin` which contains the methods to
+    push your model to the Hub. The method `save_pretrained` will save the configuration of your adapter model in a
+    directory. The method `from_pretrained` will load the configuration of your adapter model from a directory.
+
+    Args:
+        peft_type (Union[[`~peft.utils.config.PeftType`], `str`]): The type of Peft method to use.
+    """
+    peft_type: Optional[PeftType] = field(default=None, metadata={"help": "The type of PEFT model."})
+
+    @property
+    def __dict__(self):
+        return asdict(self)
+
+    def to_dict(self):
+        return self.__dict__
+
+    def save_pretrained(self, save_directory, **kwargs):
+        r"""
+        This method saves the configuration of your adapter model in a directory.
+
+        Args:
+            save_directory (`str`):
+                The directory where the configuration will be saved.
+            **kwargs:
+                Additional keyword arguments passed along to the `transformers.utils.PushToHubMixin.push_to_hub`
+                method.
+        """
+        if os.path.isfile(save_directory):
+            raise AssertionError(f"Provided path ({save_directory}) should be a directory, not a file")
+
+        os.makedirs(save_directory, exist_ok=True)
+
+        output_dict = self.__dict__
+        output_path = os.path.join(save_directory, CONFIG_NAME)
+
+        # save it
+        with open(output_path, "w") as writer:
+            writer.write(json.dumps(output_dict, indent=2, sort_keys=True))
+
+    @classmethod
+    def from_pretrained(cls, pretrained_model_name_or_path, **kwargs):
+        r"""
+        This method loads the configuration of your adapter model from a directory.
+
+        Args:
+            pretrained_model_name_or_path (`str`):
+                The directory or the hub-id where the configuration is saved.
+            **kwargs:
+                Additional keyword arguments passed along to the child class initialization.
+        """
+        if os.path.isfile(os.path.join(pretrained_model_name_or_path, CONFIG_NAME)):
+            config_file = os.path.join(pretrained_model_name_or_path, CONFIG_NAME)
+        else:
+            try:
+                config_file = hf_hub_download(pretrained_model_name_or_path, CONFIG_NAME)
+            except:
+                raise ValueError(f"Can't find config.json at '{pretrained_model_name_or_path}'")
+
+        loaded_attributes = cls.from_json_file(config_file)
+
+        config = cls(**kwargs)
+
+        for key, value in loaded_attributes.items():
+            if hasattr(config, key):
+                setattr(config, key, value)
+
+        return config
+
+    @classmethod
+    def from_json_file(cls, path_json_file, **kwargs):
+        r"""
+        Loads a configuration file from a json file.
+
+        Args:
+            path_json_file (`str`):
+                The path to the json file.
+        """
+        with open(path_json_file, "r") as file:
+            json_object = json.load(file)
+
+        return json_object
+
+
+@dataclass
+class PeftConfig(PeftConfigMixin):
     """
     This is the base configuration class to store the configuration of a :class:`~peft.PeftModel`.
 
@@ -43,6 +137,7 @@ class PeftConfig:
         inference_mode (`bool`, defaults to `False`): Whether to use the Peft model in inference mode.
     """
 
+    base_model_name_or_path: str = field(default=None, metadata={"help": "The name of the base model to use."})
     peft_type: Union[str, PeftType] = field(default=None, metadata={"help": "Peft type"})
     task_type: Union[str, TaskType] = field(default=None, metadata={"help": "Task type"})
     inference_mode: bool = field(default=False, metadata={"help": "Whether to use inference mode"})

tests/test_config.py

@@ -0,0 +1,98 @@
+# coding=utf-8
+# Copyright 2023-present the HuggingFace Inc. team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import unittest
+import tempfile
+import os
+
+from peft import LoraConfig, PromptEncoderConfig, PrefixTuningConfig, PromptTuningConfig
+
+class PeftConfigTestMixin:
+    all_config_classes = (
+        LoraConfig,
+        PromptEncoderConfig,
+        PrefixTuningConfig,
+        PromptTuningConfig,
+    )
+
+
+class PeftConfigTester(unittest.TestCase, PeftConfigTestMixin):
+    def test_methods(self):
+        r"""
+        Test if all configs have the expected methods. Here we test
+        - to_dict
+        - save_pretrained
+        - from_pretrained
+        - from_json_file
+        """
+        # test if all configs have the expected methods
+        for config_class in self.all_config_classes:
+            config = config_class()
+            self.assertTrue(hasattr(config, "to_dict"))
+            self.assertTrue(hasattr(config, "save_pretrained"))
+            self.assertTrue(hasattr(config, "from_pretrained"))
+            self.assertTrue(hasattr(config, "from_json_file"))
+
+    def test_task_type(self):
+        for config_class in self.all_config_classes:
+            # assert this will not fail
+            _ = config_class(task_type="test")
+
+
+    def test_save_pretrained(self):
+        r"""
+        Test if the config is correctly saved and loaded using 
+        - save_pretrained
+        """
+        for config_class in self.all_config_classes:
+            config = config_class()
+            with tempfile.TemporaryDirectory() as tmp_dirname:
+                config.save_pretrained(tmp_dirname)
+
+                config_from_pretrained = config_class.from_pretrained(tmp_dirname)
+                self.assertEqual(config.to_dict(), config_from_pretrained.to_dict())
+
+    def test_from_json_file(self):
+        for config_class in self.all_config_classes:
+            config = config_class()
+            with tempfile.TemporaryDirectory() as tmp_dirname:
+                config.save_pretrained(tmp_dirname)
+
+                config_from_json = config_class.from_json_file(os.path.join(tmp_dirname, "adapter_config.json"))
+                self.assertEqual(config.to_dict(), config_from_json)
+
+
+    def test_to_dict(self):
+        r"""
+        Test if the config can be correctly converted to a dict using:
+        - to_dict 
+        - __dict__
+        """
+        for config_class in self.all_config_classes:
+            config = config_class()
+            self.assertEqual(config.to_dict(), config.__dict__)
+            self.assertTrue(isinstance(config.to_dict(), dict))
+
+
+    def test_set_attributes(self):
+        # manually set attributes and check if they are correctly written
+        for config_class in self.all_config_classes:
+            config = config_class(peft_type="test")
+
+            # save pretrained
+            with tempfile.TemporaryDirectory() as tmp_dirname:
+                config.save_pretrained(tmp_dirname)
+
+                config_from_pretrained = config_class.from_pretrained(tmp_dirname)
+                self.assertEqual(config.to_dict(), config_from_pretrained.to_dict())