[GitHub] [incubator-tvm] comaniac commented on a change in pull request #5962: [Ansor][AutoTVM v2.0] Part 0: Ansor minimum system for auto schedule generating

[GitBox <gi...@apache.org>]

comaniac commented on a change in pull request #5962:
URL: https://github.com/apache/incubator-tvm/pull/5962#discussion_r448092322



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File path: python/tvm/ansor/auto_schedule.py
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@@ -0,0 +1,186 @@
+# 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.
+
+"""User interface for auto-scheduler"""
+
+import tvm._ffi
+from tvm.runtime import Object
+from .measure import LocalBuilder, LocalRunner
+from . import _ffi_api
+
+
+@tvm._ffi.register_object("ansor.HardwareParams")
+class HardwareParams(Object):
+    """ The parameters of target hardware, this is used to guide the search process of
+    SearchPolicy.
+
+    Parameters
+    ----------
+    num_cores : int
+        The number of device cores.
+    vector_unit_bytes : int
+        The width of vector units in bytes.
+    cache_line_bytes : int
+        The size of cache line in bytes.
+    max_unroll_vec : int
+        The max length of an axis to be unrolled or vectorized.
+    max_innermost_split_factor : int
+        The max split factor for the innermost tile.
+    """
+    def __init__(self, num_cores, vector_unit_bytes, cache_line_bytes,
+                 max_unroll_vec, max_innermost_split_factor):
+        self.__init_handle_by_constructor__(_ffi_api.HardwareParams, num_cores,
+                                            vector_unit_bytes, cache_line_bytes,
+                                            max_unroll_vec, max_innermost_split_factor)
+
+
+@tvm._ffi.register_object("ansor.SearchTask")
+class SearchTask(Object):
+    """ The meta-information of a search task.
+
+    Parameters
+    ----------
+    dag : ComputeDAG
+        The ComputeDAG for target compute declaration.
+    workload_key : str
+        The workload key for target compute declaration.
+    target : tvm.target.Target
+        The target device of this search task.
+    target_host : tvm.target.Target
+        The target host device of this search task.
+    hardware_params : HardwareParams
+        Hardware parameters used in this search task.
+    """
+    def __init__(self, dag, workload_key, target, target_host=None,
+                 hardware_params=None):
+        self.__init_handle_by_constructor__(_ffi_api.SearchTask, dag,
+                                            workload_key, target, target_host,
+                                            hardware_params)
+
+
+@tvm._ffi.register_object("ansor.SearchPolicy")
+class SearchPolicy(Object):
+    """ The base class for search policy  """
+
+
+@tvm._ffi.register_object("ansor.EmptyPolicy")
+class EmptyPolicy(SearchPolicy):
+    """ This is an example empty search policy which will always generate
+    the init state of target ComputeDAG.
+    """
+    def __init__(self):
+        self.__init_handle_by_constructor__(_ffi_api.EmptyPolicy)
+
+
+@tvm._ffi.register_object("ansor.TuneOption")
+class TuneOption(Object):
+    """ The options for tuning
+
+    Parameters
+    ----------
+    n_trials: int
+      Number of total measurement trials
+    early_stopping: int
+      Stops early the tuning if no improvement after n measurements
+    num_measure_per_round: int
+      The number of programs to be measured at each iteration
+    verbose: int
+      Verbosity level. 0 means silent.
+    builder: Builder
+      Builder which builds the program
+    runner: Runner
+      Runner which runs the program and measure time costs
+    measure_callbacks: List[MeasureCallback]
+      Callback functions called after each measure
+      Candidates:
+        - ansor.LogToFile
+    pre_search_callbacks: List[SearchCallback]
+      Callback functions called before the search process
+      Candidates:
+        - ansor.PreloadMeasuredStates(will be added later)
+        - ansor.PreloadCustomSketchRule(will be added later)
+    """
+    def __init__(self, n_trials=0, early_stopping=-1, num_measure_per_round=64,
+                 verbose=1, builder='local', runner='local', measure_callbacks=None,
+                 pre_search_callbacks=None):
+        if isinstance(builder, str):
+            if builder == 'local':
+                builder = LocalBuilder()
+            else:
+                raise ValueError("Invalid builder: " + builder)
+
+        if isinstance(runner, str):
+            if runner == 'local':
+                runner = LocalRunner()
+            else:
+                raise ValueError("Invalid builder: " + runner)
+
+        if measure_callbacks is None:
+            measure_callbacks = []
+
+        if pre_search_callbacks is None:
+            pre_search_callbacks = []
+
+        self.__init_handle_by_constructor__(
+            _ffi_api.TuneOption, n_trials, early_stopping, num_measure_per_round,
+            verbose, builder, runner, measure_callbacks, pre_search_callbacks)
+
+
+def auto_schedule(workload, target=None,
+                  target_host=None, search_policy='default',
+                  hardware_params=None, tune_option=None):
+    """ Do auto scheduling for a computation declaration.
+
+    The workload parameter can be a `string` as workload_key, or directly
+    passing a `SearchTask` as input.
+
+    Parameters
+    ----------
+    workload : Union[SearchTask, str]
+        The target search task or workload key.
+    target : Target
+        The target device of this schedule search.
+    target_host : Target = None
+        The target host device of this schedule search.
+    search_policy : Union[SearchPolicy, str]
+        The search policy to be used for schedule search.
+    hardware_params : HardwareParams
+        The hardware parameters of this schedule search.
+    tune_option : TuneOption
+        Tuning and measurement options.
+
+    Returns
+    -------
+        A `te.schedule` and the target `te.Tensor`s to be used in `tvm.lower` or `tvm.build`
+    """
+    if isinstance(search_policy, str):
+        if search_policy == 'default':
+            search_policy = EmptyPolicy()
+        else:
+            raise ValueError("Invalid search policy: " + search_policy)
+
+    if tune_option is None:
+        tune_option = TuneOption(n_trials=0)

Review comment:
       Ah I see...this behavior seems not trivial. For example, users may ask what would be the stopping criteria if we don't do any measurement.




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