假设我们通过 Pytorch-XLA 或 Tensorflow 从模型中获得了 HLO protobuf。
在Python中,输入具有以下类型[链接]。
hlo_pb2.HloModuleProto()
我认为一种方法是遵循这个两步流程。
这是一个示例片段,您需要对其进行调整以实现步骤 1
以下示例代码片段演示了如何从 HLO protobuf 对象中提取信息并使用 PyTorch 将其转换为 ONNX 文件:
import torch
import onnx
from onnx import helper
from onnx import AttributeProto, TensorProto, GraphProto
def convert_hlo_to_onnx(hlo_module):
# Create an empty ONNX graph
graph = helper.make_graph([], "hlo_model", [], [])
# Keep track of the ONNX node names and their corresponding outputs
node_outputs = {}
# Iterate over the HLO computations and instructions
for computation in hlo_module.computations:
# Iterate over the HLO instructions in the computation
for instruction in computation.instructions:
# Extract instruction attributes
instruction_name = instruction.name
instruction_opcode = instruction.opcode
instruction_outputs = instruction.operand
# Create ONNX node with corresponding inputs and outputs
onnx_node = helper.make_node(instruction_opcode, instruction.operand, instruction_outputs, name=instruction_name)
# Set any additional attributes for the ONNX node if needed
# For example, if the HLO instruction has attributes 'attr1' and 'attr2',
# you can add them to the ONNX node as follows:
# onnx_node.attribute.extend([
# helper.make_attribute('attr1', instruction.attr1),
# helper.make_attribute('attr2', instruction.attr2)
# ])
# Add the ONNX node to the graph
graph.node.extend([onnx_node])
# Update the node_outputs dictionary with the current ONNX node outputs
node_outputs[instruction_name] = instruction_outputs
# Iterate over the HLO computations again to establish connections between nodes
for computation in hlo_module.computations:
# Iterate over the HLO instructions in the computation
for instruction in computation.instructions:
# Get the current instruction name and its outputs
instruction_name = instruction.name
instruction_outputs = instruction.operand
# Iterate over the outputs and connect them to the corresponding inputs
for output in instruction_outputs:
# Check if the output is used as an input in any subsequent instruction
if output in node_outputs:
# Get the corresponding ONNX node output name
onnx_node_output = node_outputs[output]
# Find the ONNX node with the same name as the current instruction
onnx_node = next(node for node in graph.node if node.name == instruction_name)
# Update the inputs of the ONNX node to connect with the output of the previous node
onnx_node.input.remove(output)
onnx_node.input.extend(onnx_node_output)
# Create the ONNX model with the graph
model = helper.make_model(graph)
# Save the ONNX model to a file
onnx.save_model(model, "converted_model.onnx")
# Assuming you have an HLO module protobuf object named 'hlo_module'
hlo_module = hlo_pb2.HloModuleProto()
# Call the conversion function
convert_hlo_to_onnx(hlo_module)
在此示例中,我们迭代 HloModuleProto 的计算和指令字段。每条指令代表计算中的一条 HLO 指令。我们提取指令名称、操作码和输出。然后,我们使用 helper.make_node() 创建一个 ONNX 节点并相应地设置输入、输出和属性。我们将 ONNX 节点添加到图中,并在 node_outputs 字典中跟踪节点输出。
创建 ONNX 图后,我们使用
helper.make_model()
使用该图创建 ONNX 模型,最后使用 onnx.save_model()
将 ONNX 模型保存到文件(本例中为“converted_model.onnx”)。
请注意,此代码假设您已安装必要的依赖项,包括 onnx 和 torch 软件包。另外,请确保从 onnx 包中导入相关模块(onnx、helper、AttributeProto、TensorProto、GraphProto)。
请记住调整此代码以适合您特定的 HLO protobuf 结构和属性。