[feature] add gptq for inference

LICENSE

@@ -428,3 +428,52 @@ Copyright 2021- HPC-AI Technology Inc. All rights reserved.
    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.
+   ---------------- LICENSE FOR AutoGPTQ ----------------
+
+   From AutoGPTQ:
+
+   MIT License
+
+   Copyright (c) 2023 潘其威(William)
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in all
+   copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+   SOFTWARE.
+
+   ---------------- LICENSE FOR exllama ----------------
+
+   From exllama:
+
+   MIT License
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in all
+   copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+   SOFTWARE.

colossalai/inference/quant/gptq/__init__.py

@@ -0,0 +1,4 @@
+from .cai_gptq import HAS_AUTO_GPTQ
+
+if HAS_AUTO_GPTQ:
+    from .cai_gptq import CaiGPTQLinearOp, CaiQuantLinear

colossalai/inference/quant/gptq/cai_gptq/__init__.py

@@ -0,0 +1,13 @@
+import warnings
+
+HAS_AUTO_GPTQ = False
+try:
+    import auto_gptq
+    HAS_AUTO_GPTQ = True
+except ImportError:
+    warnings.warn('please install auto-gptq from https://github.com/PanQiWei/AutoGPTQ')
+    HAS_AUTO_GPTQ = False
+
+if HAS_AUTO_GPTQ:
+    from .cai_quant_linear import CaiQuantLinear, ColCaiQuantLinear, RowCaiQuantLinear
+    from .gptq_op import CaiGPTQLinearOp