# Copyright 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # * Neither the name of NVIDIA CORPORATION nor the names of its # contributors may be used to endorse or promote products derived # from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY # OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. import json import numpy as np import triton_python_backend_utils as pb_utils from transformers import AutoTokenizer, LlamaTokenizer, T5Tokenizer class TritonPythonModel: """Your Python model must use the same class name. Every Python model that is created must have "TritonPythonModel" as the class name. """ def initialize(self, args): """`initialize` is called only once when the model is being loaded. Implementing `initialize` function is optional. This function allows the model to initialize any state associated with this model. Parameters ---------- args : dict Both keys and values are strings. The dictionary keys and values are: * model_config: A JSON string containing the model configuration * model_instance_kind: A string containing model instance kind * model_instance_device_id: A string containing model instance device ID * model_repository: Model repository path * model_version: Model version * model_name: Model name """ # Parse model configs model_config = json.loads(args['model_config']) tokenizer_dir = model_config['parameters']['tokenizer_dir'][ 'string_value'] tokenizer_type = model_config['parameters']['tokenizer_type'][ 'string_value'] self.skip_special_tokens = model_config['parameters'].get( 'skip_special_tokens', {'string_value': "true"})['string_value'].lower() in [ 'true', '1', 't', 'y', 'yes' ] if tokenizer_type == 't5': self.tokenizer = T5Tokenizer(vocab_file=tokenizer_dir, padding_side='left') elif tokenizer_type == 'auto': self.tokenizer = AutoTokenizer.from_pretrained( tokenizer_dir, padding_side='left', trust_remote_code=True) elif tokenizer_type == 'llama': self.tokenizer = LlamaTokenizer.from_pretrained( tokenizer_dir, legacy=False, padding_side='left') else: raise AttributeError( f'Unexpected tokenizer type: {tokenizer_type}') self.tokenizer.pad_token = self.tokenizer.eos_token # Parse model output configs output_config = pb_utils.get_output_config_by_name( model_config, "OUTPUT") # Convert Triton types to numpy types self.output_dtype = pb_utils.triton_string_to_numpy( output_config['data_type']) output_lens_config = pb_utils.get_output_config_by_name( model_config, "OUTPUT_LENS") def execute(self, requests): """`execute` must be implemented in every Python model. `execute` function receives a list of pb_utils.InferenceRequest as the only argument. This function is called when an inference is requested for this model. Depending on the batching configuration (e.g. Dynamic Batching) used, `requests` may contain multiple requests. Every Python model, must create one pb_utils.InferenceResponse for every pb_utils.InferenceRequest in `requests`. If there is an error, you can set the error argument when creating a pb_utils.InferenceResponse. Parameters ---------- requests : list A list of pb_utils.InferenceRequest Returns ------- list A list of pb_utils.InferenceResponse. The length of this list must be the same as `requests` """ responses = [] # Every Python backend must iterate over everyone of the requests # and create a pb_utils.InferenceResponse for each of them. for idx, request in enumerate(requests): # Get input tensors tokens_batch = pb_utils.get_input_tensor_by_name( request, 'TOKENS_BATCH').as_numpy() # Get sequence length sequence_lengths = pb_utils.get_input_tensor_by_name( request, 'SEQUENCE_LENGTH').as_numpy() # Get cum log probs cum_log_probs = pb_utils.get_input_tensor_by_name( request, 'CUM_LOG_PROBS').as_numpy() # Get sequence length output_log_probs = pb_utils.get_input_tensor_by_name( request, 'OUTPUT_LOG_PROBS').as_numpy() # Reshape Input # tokens_batch = tokens_batch.reshape([-1, tokens_batch.shape[0]]) # tokens_batch = tokens_batch.T # Postprocessing output data. outputs, output_lens = self._postprocessing(tokens_batch, sequence_lengths) # Create output tensors. You need pb_utils.Tensor # objects to create pb_utils.InferenceResponse. output_tensor = pb_utils.Tensor( 'OUTPUT', np.array(outputs).astype(self.output_dtype)) out_cum_log_probs = pb_utils.Tensor('OUT_CUM_LOG_PROBS', cum_log_probs) out_output_log_probs = pb_utils.Tensor('OUT_OUTPUT_LOG_PROBS', output_log_probs) # Create InferenceResponse. You can set an error here in case # there was a problem with handling this inference request. # Below is an example of how you can set errors in inference # response: # # pb_utils.InferenceResponse( # output_tensors=..., TritonError("An error occurred")) inference_response = pb_utils.InferenceResponse(output_tensors=[ output_tensor, out_cum_log_probs, out_output_log_probs ]) responses.append(inference_response) # You should return a list of pb_utils.InferenceResponse. Length # of this list must match the length of `requests` list. return responses def finalize(self): """`finalize` is called only once when the model is being unloaded. Implementing `finalize` function is optional. This function allows the model to perform any necessary clean ups before exit. """ print('Cleaning up...') def _postprocessing(self, tokens_batch, sequence_lengths): outputs = [] for batch_idx, beam_tokens in enumerate(tokens_batch): for beam_idx, tokens in enumerate(beam_tokens): seq_len = sequence_lengths[batch_idx][beam_idx] output = self.tokenizer.decode( tokens[:seq_len], skip_special_tokens=self.skip_special_tokens) outputs.append(output.encode('utf8')) return outputs