huajsj commented on a change in pull request #8702: URL: https://github.com/apache/tvm/pull/8702#discussion_r708863450
########## File path: python/tvm/contrib/pipeline_executor.py ########## @@ -0,0 +1,539 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you 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 +# +# http://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. +"""Pipeline executor that executes a series of modules in a pipeline fashion.""" +import json +import tvm._ffi +from tvm import relay +from tvm.relay.transform import InferType +from tvm.contrib import graph_executor + + +def pipeline_executor_enabled(): + """Check if the pipeline executor is enabled. + + Return + ------- + enable: bool + Return whether the pipeline executor is enabled. + """ + return tvm._ffi.get_global_func("tvm.pipeline_executor.create", allow_missing=True) is not None + + +def build(pipe_configs): + """Build these modules used in the pipeline executor, then use these modules and configuration + to create a pipeline executor. + + Parameters + ---------- + pipe_configs: PipelineConfig + Build Configuration information. + + Returns + ------- + ret: PipelineExecutorFactoryModule + Common interface for pipeline executor factory modules. + """ + mods = {} + mod_n_configs = pipe_configs.get_config() + config_len = len(mod_n_configs) + string_config = [{} for _ in range(config_len)] + for ir_mod, mod_config in mod_n_configs.items(): + mconf = mod_config["pipeline"].copy() + mod_idx = mconf["mod_idx"] - 1 + dev = mod_config["dev"] + target = mod_config["target"] + build_func = relay.build + # Check whether there is a customized build function. + if "build" in mod_config and mod_config["build"]: + build_func = mod_config["build"] + + mod = build_func( + ir_mod, + target, + params=mod_config["params"], + target_host=mod_config["target_host"], + mod_name=mod_config["mod_name"], + ) + + mconf["dev"] = "{},{}".format(dev.device_type, dev.device_id) + # Create a pipeline configuration. + string_config[mod_idx] = mconf + mods[mod] = {"dev": dev} + + return PipelineExecutorFactoryModule(mods, string_config) + + +class PipelineModule(object): + """Wrapper of runtime module, caller can use this module to set parameters and get outputs. + + Parameters + ---------- + module : PipelineExecutorFactoryModule + Common interface for pipeline executor factory modules. + """ + + def __init__(self, module): + self.module = module.module + + +class PipelineConfig(object): + """Pipeline configuration information, this class contains the DAG that expresses + the dependency of each module involved by pipeline and the specific parameters + of each module build. + """ + + class Binding: + """This class defines the module connections information. + The type can only be "input" or "output". + + Parameters + ---------- + owner : ModuleWrapper + The class who owns this interface. + + io_type : str + The I/O type of this interface. It can only be "input" or "output". + + name : str/integer + Name, for input it is string such as "data0", for output it is an integer such as 0. + + data_type: TensorType + The data type of this interface. + """ + + def __init__(self, owner, io_type, name, data_type=None): + self.io_owner = owner + self.io_type = io_type + self.name = str(name) + # Child interfaces that depend on this interface. + self.bindings = [] + # Parents interfaces that this interface depend on. + self.parents = [] + + self.data_type = data_type + + def get_name(self): + # Return name of this interface and the name of owner who owns this interface. + owner_name = "" + if isinstance(self.io_owner, PipelineConfig.ModuleWrapper): + owner_name = self.io_owner.name + + return owner_name, self.name + + def get_owner_idx(self): + # If the owner is ModuleWrapper return the owner index, if not return 0. + if isinstance(self.io_owner, PipelineConfig.ModuleWrapper): + return self.io_owner.idx + + return 0 + + def is_global_interface(self): + """The global interface is the interface visible to the caller which use a pipeline + executor, the global input interface is responsible for passing parameters to the + internal module interface, and the global output interface is responsible for + outputting the results computed by the pipeline executor to a caller. + """ + return not isinstance(self.io_owner, PipelineConfig.ModuleWrapper) + + def __repr__(self): + # Get all binding information. + ret = " |{}: ".format(self.name) + for binding in self.bindings: + mname, dname = binding.get_name() + ret += "{0}:{1} ".format(mname, dname) + return ret + + def check_dag_acyclic(self, start, inputs): + """This is to check whether the DAG containing these input interfaces is acyclic. + Parameters + ---------- + start: ModuleWrapper + The starting node of the cycle check algorithm. + + inputs: Binding + These interfaces are used to connect to each other to build DAG. + + Return + ------ + Return true if there is no cycle in the DAG. + """ + for binding in inputs.values(): + if start == binding.io_owner: + return False + for p in binding.parents: + if not self.check_dag_acyclic(start, p.io_owner.input_bindings.bindings): + return False + + return True + + def connect(self, binding): + """Connect the current interface to the destination interface. + correct connections as following 1. global input connect to module input, + 2. module output connect to global output, 3. module output connect to module input Review comment: fixed. -- This is an automated message from the Apache Git Service. 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