Unsloth rope (#1767)

* Add unsloth rope embeddings support

* support for models weights in 4bit and do some memory gc

* use accelerate logger

* add unsloth llama rms norm optims

* update docs for unsloth

* more docs info

README.md

@@ -46,6 +46,7 @@ Features:
   - [Multipack](./docs/multipack.qmd)<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M17 13.5v6H5v-12h6m3-3h6v6m0-6-9 9" class="icon_svg-stroke" stroke="#666" stroke-width="1.5" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg>
   - [RLHF & DPO](./docs/rlhf.qmd)<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M17 13.5v6H5v-12h6m3-3h6v6m0-6-9 9" class="icon_svg-stroke" stroke="#666" stroke-width="1.5" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg>
   - [Dataset Pre-Processing](./docs/dataset_preprocessing.qmd)<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M17 13.5v6H5v-12h6m3-3h6v6m0-6-9 9" class="icon_svg-stroke" stroke="#666" stroke-width="1.5" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg>
+  - [Unsloth](./docs/unsloth.qmd)<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M17 13.5v6H5v-12h6m3-3h6v6m0-6-9 9" class="icon_svg-stroke" stroke="#666" stroke-width="1.5" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg>
 - [Common Errors](#common-errors-)
   - [Tokenization Mismatch b/w Training & Inference](#tokenization-mismatch-bw-inference--training)
 - [Debugging Axolotl](#debugging-axolotl)

_quarto.yml

@@ -36,6 +36,7 @@ website:
             - docs/nccl.qmd
             - docs/mac.qmd
             - docs/multi-node.qmd
+            - docs/unsloth.qmd
         - section: "Dataset Formats"
           contents: docs/dataset-formats/*
         - section: "Reference"

docs/unsloth.qmd

@@ -0,0 +1,49 @@
+---
+title: "Unsloth"
+description: "Hyper-optimized QLoRA finetuning for single GPUs"
+---
+
+### Overview
+
+Unsloth provides hand-written optimized kernels for LLM finetuning that slightly improve speed and VRAM over
+standard industry baselines.
+
+
+### Installation
+
+The following will install unsloth from source and downgrade xformers as unsloth is incompatible with the most up
+to date libraries.
+
+```bash
+pip install --no-deps "unsloth @ git+https://github.com/unslothai/unsloth.git"
+pip install --no-deps --force-reinstall xformers==0.0.26.post1
+```
+
+### Using unsloth w Axolotl
+
+Axolotl exposes a few configuration options to try out unsloth and get most of the performance gains.
+
+Our unsloth integration is currently limited to the following model architectures:
+ - llama
+
+These options are specific to LoRA finetuning and cannot be used for multi-GPU finetuning
+```yaml
+unsloth_lora_mlp: true
+unsloth_lora_qkv: true
+unsloth_lora_o: true
+```
+
+These options are composable and can be used with multi-gpu finetuning
+```
+unsloth_cross_entropy_loss: true
+unsloth_rms_norm: true
+unsloth_rope: true
+```
+
+### Limitations
+
+- Single GPU only; e.g. no multi-gpu support
+- No deepspeed or FSDP support (requires multi-gpu)
+- LoRA + QLoRA support only. No full fine tunes or fp8 support.
+- Limited model architecture support. Llama, Phi, Gemma, Mistral only
+- No MoE support.

src/axolotl/monkeypatch/unsloth_.py

@@ -1,18 +1,20 @@
 """module for patching with unsloth optimizations"""
 
 import inspect
-import logging
 import re
 import types
 from typing import Tuple
 
+import torch
+from accelerate.logging import get_logger
 from peft import PeftModelForCausalLM
+from torch import nn
 from transformers.models.llama.modeling_llama import (
     LlamaFlashAttention2,
     LlamaForCausalLM,
 )
 
-LOG = logging.getLogger("axolotl.monkeypatch.unsloth")
+LOG = get_logger("axolotl.monkeypatch.unsloth")
 
 ORIGINAL_CEL_CODE = """    if labels is not None:
         # Shift so that tokens < n predict n
@@ -137,7 +139,7 @@ def integrate_cross_entropy_loss_patch():
         globals(),
     )
     exec(forward, globals())  # pylint: disable=exec-used  # nosec B102
-    print("patching unsloth fast_cross_entropy_loss")
+    LOG.info("patching unsloth fast_cross_entropy_loss", main_process_only=True)
     LlamaForCausalLM.forward = fast_cross_entropy_loss_forward  # pylint: disable=undefined-variable  # noqa: F821
 
 
@@ -179,12 +181,30 @@ def patch_self_attn_lora():
         globals(),
     )
     exec(self_attn_forward, globals())  # pylint: disable=exec-used  # nosec B102
-    print("patching unsloth attn lora")
+    LOG.info("patching unsloth attn lora", main_process_only=True)
     LlamaFlashAttention2.forward = (
         unsloth_attn_forward  # pylint: disable=undefined-variable  # noqa: F821
     )
 
 
+def integrate_rope_embeddings():
+    import transformers.models.llama.modeling_llama
+    from unsloth.kernels.rope_embedding import fast_rope_embedding
+
+    def apply_rotary_pos_emb(  # pylint: disable=unused-argument
+        q,  # pylint: disable=invalid-name
+        k,  # pylint: disable=invalid-name
+        cos,
+        sin,
+        position_ids=None,
+        unsqueeze_dim=1,
+    ):
+        return fast_rope_embedding(q, k, cos, sin)
+
+    LOG.info("patching unsloth RoPE embeddings", main_process_only=True)
+    transformers.models.llama.modeling_llama.apply_rotary_pos_emb = apply_rotary_pos_emb
+
+
 def integrate_lora_mlp_patch(peft_model: PeftModelForCausalLM):
     if peft_model.base_model.config.model_type in ["llama", "mistral"]:
         from unsloth.kernels import apply_lora_mlp_swiglu
@@ -217,7 +237,7 @@ def integrate_lora_mlp_patch(peft_model: PeftModelForCausalLM):
         if is_mlp_lora and mlp_no_bias and mlp_not_dora:
             layer.mlp.forward = types.MethodType(apply_lora_mlp, layer.mlp)
         else:
-            logging.warning("unable to apply unsloth lora mlp patch to layer %d", idx)
+            LOG.warning("unable to apply unsloth lora mlp patch to layer %d", idx)
 
 
 def integrate_lora_patch(peft_model: PeftModelForCausalLM, cfg):
@@ -243,9 +263,7 @@ def integrate_lora_patch(peft_model: PeftModelForCausalLM, cfg):
                 layer.self_attn.apply_qkv = apply_lora_qkv
             else:
                 layer.self_attn.apply_qkv = original_apply_qkv
-                logging.warning(
-                    "unable to apply unsloth lora qkv patch to layer %d", idx
-                )
+                LOG.warning("unable to apply unsloth lora qkv patch to layer %d", idx)
         if cfg.unsloth_lora_o:
             layer_modules = [
                 getattr(layer.self_attn, linear_proj) for linear_proj in ["o_proj"]
@@ -264,6 +282,33 @@ def integrate_lora_patch(peft_model: PeftModelForCausalLM, cfg):
                 layer.self_attn.apply_o = apply_lora_o
             else:
                 layer.self_attn.apply_o = original_apply_o
-                logging.warning(
+                LOG.warning(
                     "unable to apply unsloth lora o_proj patch to layer %d", idx
                 )
+
+
+def patch_unsloth_layernorm():
+    try:
+        import transformers.models.llama.modeling_llama
+        from unsloth.kernels.rms_layernorm import Fast_RMS_Layernorm
+
+        class LlamaRMSNorm(nn.Module):
+            """LlamaRMSNorm"""
+
+            def __init__(self, hidden_size, eps=1e-6):
+                """
+                LlamaRMSNorm is equivalent to T5LayerNorm
+                """
+                super().__init__()
+                self.weight = nn.Parameter(torch.ones(hidden_size))
+                self.variance_epsilon = eps
+
+            def forward(self, hidden_states):
+                return Fast_RMS_Layernorm.apply(
+                    hidden_states, self.weight, self.variance_epsilon, False
+                )
+
+        LOG.info("patching with unsloth.kernels.rms_layernorm")
+        transformers.models.llama.modeling_llama.LlamaRMSNorm = LlamaRMSNorm
+    except ImportError:
+        LOG.warning("missing unsloth library")

src/axolotl/utils/config/models/input/v0_4_1/__init__.py

@@ -7,6 +7,7 @@
 import logging
 import os
 from enum import Enum
+from importlib.metadata import version
 from typing import Any, Dict, List, Literal, Optional, Tuple, Union
 
 from pydantic import BaseModel, Field, conlist, field_validator, model_validator
@@ -596,6 +597,8 @@ class Config:
     unsloth_lora_mlp: Optional[bool] = None
     unsloth_lora_qkv: Optional[bool] = None
     unsloth_lora_o: Optional[bool] = None
+    unsloth_rms_norm: Optional[bool] = None
+    unsloth_rope: Optional[bool] = None
 
     deepspeed: Optional[Union[str, Dict[str, Any]]] = None
     fsdp: Optional[List[str]] = None
@@ -1164,6 +1167,21 @@ def check_qlora_unsloth(cls, data):
                 )
         return data
 
+    @model_validator(mode="before")
+    @classmethod
+    def check_unsloth_xformers_version(cls, data):
+        if (
+            data.get("unsloth_lora_mlp")
+            or data.get("unsloth_lora_qkv")
+            or data.get("unsloth_lora_o")
+        ):
+            xformers_version = version("xformers")
+            if xformers_version == "0.0.27":
+                raise ValueError(
+                    "xformers version 0.0.27 is not supported with unsloth. Please downgrade to 0.0.26.post1"
+                )
+        return data
+
     @model_validator(mode="before")
     @classmethod
     def check_torch_compile_deepspeed(cls, data):

src/axolotl/utils/models.py

@@ -1,7 +1,7 @@
 """Module for models and model loading"""
 
 # pylint: disable=too-many-lines
-
+import gc
 import logging
 import math
 import os
@@ -94,7 +94,7 @@ def check_model_config(cfg: DictDefault, model_config: Union[AutoConfig, DictDef
             "Please make sure to point to a GPTQ model."
         )
 
-    if not cfg.gptq and quant_config_exists:
+    if not cfg.gptq and quant_config_exists and not cfg.load_in_4bit:
         raise ValueError(
             "model_config.quantization_config is set but `gptq` flag is not. "
             "Please use the `gptq` flag to train quantized model or point to a non-quantized model."
@@ -358,6 +358,10 @@ def load_model(
                 patch_llama_cross_entropy()
             if cfg.flash_attn_rms_norm:
                 patch_llama_rms_norm()
+            elif cfg.unsloth_rms_norm:
+                from axolotl.monkeypatch.unsloth_ import patch_unsloth_layernorm
+
+                patch_unsloth_layernorm()
             if cfg.unsloth_cross_entropy_loss:
                 from axolotl.monkeypatch.unsloth_ import (
                     integrate_cross_entropy_loss_patch,
@@ -884,6 +888,15 @@ def load_model(
 
         integrate_lora_patch(model, cfg)
 
+    if cfg.unsloth_rope:
+        from axolotl.monkeypatch.unsloth_ import integrate_rope_embeddings
+
+        integrate_rope_embeddings()
+
+    for _ in range(3):
+        gc.collect()
+        torch.cuda.empty_cache()
+
     # TODO resume_from_checkpoint handling
     return model, lora_config