Convert Orbax ckpt to HuggingFace

MaxText/llama_or_mistral_orbax_to_huggingface.py

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+
+"""
+ Copyright 2023 Google LLC
+ 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
+      https://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.
+ """
+
+r"""Convert weights from a MaxText model to a HuggingFace model.
+
+Usage:
+
+Get MaxText model weights from a MaxText run
+
+Example cmd:
+To save a ckpt
+python3 MaxText/llama_or_mistral_ckpt.py --base-model-path <path/to/meta/ckpt> \
+    --maxtext-model-path <GCS/path/to/save/new/maxtext/ckpt> --model-size llama2-7b
+
+python3 MaxText/llama_or_mistral_orbax_to_huggingface.py MaxText/configs/base.yml 
+            base_output_directory=path/to/saving/intermediate_MaxText_files
+            load_parameters_path=/path/to/MaxText/checkpoint run_name=<your run name> model_name=<llama2 or mistral> 
+            hf_model_path=/local/path/to/save/HF/model/to
+
+Note that we are saving the converted HuggingFace model to a local path. You can write to a GCS location by mounting
+the GCS bucket as a local path using `setup_gcsfuse.sh`, but remember to mount as read+write.
+"""
+
+from typing import Sequence
+import torch
+from tqdm import tqdm
+from absl import app
+import numpy as np
+import pyconfig
+import max_utils
+import jax
+from jax.sharding import Mesh
+import max_logging
+import checkpointing
+from generate_param_only_checkpoint import _read_train_checkpoint
+import llama_or_mistral_ckpt
+from transformers import LlamaForCausalLM, MistralForCausalLM
+
+def unpermute_from_match_maxtext_rope(arr):
+  """
+  Function to get the RoPE values in correct ordering
+  """
+  split_size = arr.shape[-1] // 2  # Assuming half for evens, half for odds
+  evens = arr[..., :split_size]
+  odds = arr[..., split_size:]
+  return jax.numpy.concatenate((evens, odds), axis=arr.ndim-1)
+
+def reverse_scale(arr,scale):
+  """
+  MaxText has the scaling factor included into the weights, 
+  we reverse it when writing out the HuggingFace checkpoint
+  """
+  return arr * np.sqrt(scale)
+
+def load_hf_model(model_size):
+  """
+  Load the model that we are interested in from HuggingFace
+
+  """
+  if model_size == "llama2-7b":
+    model = LlamaForCausalLM.from_pretrained("meta-llama/Llama-2-7b-hf")
+  elif model_size == "mistral-7b":
+    model = MistralForCausalLM.from_pretrained("mistralai/Mistral-7B-v0.1")
+  else:
+    raise NotImplementedError
+
+  return model
+
+def load_model_state(config):
+  """
+  Loads the MaxText model's TrainState from the Orbax checkpoint
+  """
+  devices_array = max_utils.create_device_mesh(config)
+  mesh = Mesh(devices_array, config.mesh_axes)
+
+  # Create a checkpoint manager to load decode checkpoint at config.checkpoint_dir
+  checkpoint_manager = checkpointing.create_orbax_checkpoint_manager(
+      config.checkpoint_dir,
+      config.enable_checkpointing,
+      config.async_checkpointing,
+      config.checkpoint_period,
+  )
+
+  # Read training state from config.load_paramaters_path
+  max_logging.log(f"Read training checkpoint from: {config.load_full_state_path}")
+  training_state, _ = _read_train_checkpoint(config, checkpoint_manager, mesh)
+  return training_state
+
+
+def convert_state_to_hf(training_state, model_size):
+  """
+  Port the parameters from the Orbax training_state into the hf_model
+  """
+
+  if model_size not in llama_or_mistral_ckpt.MODEL_PARAMS_DICT:
+    raise NotImplementedError
+  # Load the model specific parameters
+  model_params = llama_or_mistral_ckpt.MODEL_PARAMS_DICT[model_size]
+  base_num_decoder_layers = model_params['num_layers']
+  base_num_query_heads = model_params['num_heads']
+  head_dim = model_params['dims_per_head']
+  base_num_kv_heads = model_params['num_kv_heads']
+
+
+  hf_model_params = {}
+
+  #Port the embedding weights
+  hf_model_params["model.embed_tokens.weight"] = torch.tensor(
+                    np.asarray(training_state.params['params']['token_embedder']['embedding']),
+                                    dtype=torch.float32)
+
+  for layer_int in tqdm(range(base_num_decoder_layers),desc="Porting parameters layerwise"):
+
+    #Attention layers
+    hf_model_params[f"model.layers.{layer_int}.self_attn.q_proj.weight"] = torch.tensor(np.asarray(
+        unpermute_from_match_maxtext_rope(
+          reverse_scale(
+            training_state.params['params']["decoder"]["layers"]["self_attention"]["query"]["kernel"][:, layer_int, :, :]
+            ,head_dim
+            )
+            ).reshape(base_num_query_heads * head_dim,base_num_query_heads * head_dim).T),
+        dtype=torch.float32
+    )
+
+    hf_model_params[f"model.layers.{layer_int}.self_attn.k_proj.weight"] = torch.tensor(np.asarray(
+        unpermute_from_match_maxtext_rope(
+          training_state.params['params']["decoder"]["layers"]["self_attention"]["key"]["kernel"][:, layer_int, :, :]
+          ).reshape(base_num_query_heads * head_dim, base_num_kv_heads * head_dim).T),
+        dtype=torch.float32
+    )
+    hf_model_params[f"model.layers.{layer_int}.self_attn.v_proj.weight"] = torch.tensor(np.asarray(
+         training_state.params['params']["decoder"]["layers"]["self_attention"]["value"]["kernel"][:, layer_int, :, :]
+         .reshape(base_num_query_heads * head_dim, base_num_kv_heads * head_dim).T),
+         dtype=torch.float32
+    )
+    hf_model_params[f"model.layers.{layer_int}.self_attn.o_proj.weight"] = torch.tensor(np.asarray(
+        training_state.params['params']["decoder"]["layers"]["self_attention"]["out"]["kernel"][:, layer_int, :, :]
+        .reshape(base_num_query_heads * head_dim,base_num_query_heads * head_dim).T),
+        dtype=torch.float32
+    )
+
+    #MLP Layers
+    hf_model_params[f"model.layers.{layer_int}.mlp.gate_proj.weight"] = torch.tensor(np.asarray(
+        training_state.params['params']["decoder"]["layers"]["mlp"]["wi_0"]["kernel"][:,layer_int,:].T),
+        dtype=torch.float32
+    )
+    hf_model_params[f"model.layers.{layer_int}.mlp.up_proj.weight"] = torch.tensor(np.asarray(
+        training_state.params['params']["decoder"]["layers"]["mlp"]["wi_1"]["kernel"][:,layer_int,:].T),
+        dtype=torch.float32
+    )
+    hf_model_params[f"model.layers.{layer_int}.mlp.down_proj.weight"] = torch.tensor(np.asarray(
+        training_state.params['params']["decoder"]["layers"]["mlp"]["wo"]["kernel"][:,layer_int,:].T),
+        dtype=torch.float32
+    )
+
+    #Pre/post attention layer norm
+    hf_model_params[f"model.layers.{layer_int}.input_layernorm.weight"] = torch.tensor(np.asarray(
+      training_state.params['params']["decoder"]["layers"]["pre_self_attention_layer_norm"]["scale"][:,layer_int]
+      .reshape(base_num_query_heads * head_dim)),
+      dtype=torch.float32
+    )
+    hf_model_params[f"model.layers.{layer_int}.post_attention_layernorm.weight"] = torch.tensor(np.asarray(
+      training_state.params['params']["decoder"]["layers"]["post_self_attention_layer_norm"]["scale"][:,layer_int]
+      .reshape(base_num_query_heads * head_dim)),
+      dtype=torch.float32
+    )
+  #LM head and layernorm
+    hf_model_params["lm_head.weight"] = torch.tensor(np.asarray(
+      training_state.params['params']["decoder"]["logits_dense"]["kernel"].T),
+      dtype=torch.float32
+    )
+    hf_model_params["model.norm.weight"] = torch.tensor(np.asarray(
+      training_state.params['params']["decoder"]["decoder_norm"]["scale"].reshape(base_num_query_heads * head_dim)),
+      dtype=torch.float32
+    )
+
+  return hf_model_params
+
+
+
+def convert_orbax_hf(hf_model_path, config):
+  """
+  Landing function to convert MaxText model's checkpoint to HuggingFace format
+  """
+  hf_model = load_hf_model(config.model_name)
+  training_state = load_model_state(config)
+  new_hf_model_params = convert_state_to_hf(training_state, config.model_name)
+  print(f"Saving HuggingFace model to path = {hf_model_path}")
+  hf_model.save_pretrained(hf_model_path, state_dict=new_hf_model_params)
+
+
+
+def main(argv: Sequence[str]):
+
+  pyconfig.initialize(argv[:-1])
+  #Assuming the last argument is the path to save the converted checkpoint in HuggingFace format
+  hf_model_path = argv[-1].split("=")[1]
+  print(f"Will save converted HuggingFace checkpoint to path = {hf_model_path}")
+
+  convert_orbax_hf(hf_model_path, pyconfig.config)
+
+
+if __name__ == "__main__":
+  app.run(main)