# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
#
# 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
#
#     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.
# ==============================================================================
"""Utilities for building profiler options."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import copy

from tensorflow.python.profiler import tfprof_logger


class ProfileOptionBuilder(object):
  # pylint: disable=line-too-long
  """Option Builder for Profiling API.

  For tutorial on the options, see
  https://github.com/tensorflow/tensorflow/tree/master/tensorflow/core/profiler/g3doc/options.md

  ```python
  # Users can use pre-built options:
  opts = (
      tf.profiler.ProfileOptionBuilder.trainable_variables_parameter())

  # Or, build your own options:
  opts = (tf.profiler.ProfileOptionBuilder()
      .with_max_depth(10)
      .with_min_micros(1000)
      .select(['accelerator_micros'])
      .with_stdout_output()
      .build()

  # Or customize the pre-built options:
  opts = (tf.profiler.ProfileOptionBuilder(
      tf.profiler.ProfileOptionBuilder.time_and_memory())
      .with_displaying_options(show_name_regexes=['.*rnn.*'])
      .build())

  # Finally, profiling with the options:
  _ = tf.profiler.profile(tf.get_default_graph(),
                          run_meta=run_meta,
                          cmd='scope',
                          options=opts)
  ```
  """
  # pylint: enable=line-too-long

  def __init__(self, options=None):
    """Constructor.

    Args:
      options: Optional initial option dict to start with.
    """
    if options is not None:
      self._options = copy.deepcopy(options)
    else:
      self._options = {'max_depth': 100,
                       'min_bytes': 0,
                       'min_micros': 0,
                       'min_params': 0,
                       'min_float_ops': 0,
                       'min_occurrence': 0,
                       'order_by': 'name',
                       'account_type_regexes': ['.*'],
                       'start_name_regexes': ['.*'],
                       'trim_name_regexes': [],
                       'show_name_regexes': ['.*'],
                       'hide_name_regexes': [],
                       'account_displayed_op_only': False,
                       'select': ['micros'],
                       'step': -1,
                       'output': 'stdout'}

  @staticmethod
  def trainable_variables_parameter():
    """Options used to profile trainable variable parameters.

    Normally used together with 'scope' view.

    Returns:
      A dict of profiling options.
    """
    return {'max_depth': 10000,
            'min_bytes': 0,
            'min_micros': 0,
            'min_params': 0,
            'min_float_ops': 0,
            'min_occurrence': 0,
            'order_by': 'name',
            'account_type_regexes': [tfprof_logger.TRAINABLE_VARIABLES],
            'start_name_regexes': ['.*'],
            'trim_name_regexes': [],
            'show_name_regexes': ['.*'],
            'hide_name_regexes': [],
            'account_displayed_op_only': True,
            'select': ['params'],
            'step': -1,
            'output': 'stdout'}

  @staticmethod
  def float_operation():
    # pylint: disable=line-too-long
    """Options used to profile float operations.

    Please see https://github.com/tensorflow/tensorflow/tree/master/tensorflow/core/profiler/g3doc/profile_model_architecture.md
    on the caveats of calculating float operations.

    Returns:
      A dict of profiling options.
    """
    # pylint: enable=line-too-long
    return {'max_depth': 10000,
            'min_bytes': 0,
            'min_micros': 0,
            'min_params': 0,
            'min_float_ops': 1,
            'min_occurrence': 0,
            'order_by': 'float_ops',
            'account_type_regexes': ['.*'],
            'start_name_regexes': ['.*'],
            'trim_name_regexes': [],
            'show_name_regexes': ['.*'],
            'hide_name_regexes': [],
            'account_displayed_op_only': True,
            'select': ['float_ops'],
            'step': -1,
            'output': 'stdout'}

  @staticmethod
  def time_and_memory(min_micros=1, min_bytes=1):
    """Show operation time and memory consumptions.

    Args:
      min_micros: Only show profiler nodes with more execution time than this.
      min_bytes: Only show profiler nodes consuming more memory than this.
    Returns:
      A dict of profiling options.
    """
    return {'max_depth': 10000,
            'min_bytes': min_bytes,
            'min_micros': min_micros,
            'min_params': 0,
            'min_float_ops': 0,
            'min_occurrence': 0,
            'order_by': 'name',
            'account_type_regexes': ['.*'],
            'start_name_regexes': ['.*'],
            'trim_name_regexes': [],
            'show_name_regexes': ['.*'],
            'hide_name_regexes': [],
            'account_displayed_op_only': True,
            'select': ['micros', 'bytes'],
            'step': -1,
            'output': 'stdout'}

  def build(self):
    """Build a profiling option.

    Returns:
      A dict of profiling options.
    """
    return copy.deepcopy(self._options)

  def with_max_depth(self, max_depth):
    """Set the maximum depth of display.

    The depth depends on profiling view. For 'scope' view, it's the
    depth of name scope hierarchy (tree), for 'op' view, it's the number
    of operation types (list), etc.

    Args:
      max_depth: Maximum depth of the data structure to display.
    Returns:
      self
    """
    self._options['max_depth'] = max_depth
    return self

  def with_min_memory(self, min_bytes):
    """Only show profiler nodes consuming no less than 'min_bytes'.

    Args:
      min_bytes: Only show profiler nodes with memory consumption
          no less than this.
    Returns:
      self
    """
    self._options['min_bytes'] = min_bytes
    return self

  def with_min_execution_time(self, min_micros):
    """Only show profiler nodes consuming no less than 'min_micros'.

    Args:
      min_micros: Only show profiler nodes with execution time
          no less than this.
    Returns:
      self
    """
    self._options['min_micros'] = min_micros
    return self

  def with_min_parameters(self, min_params):
    """Only show profiler nodes holding no less than 'min_params' parameters.

    'Parameters' normally refers the weights of in TensorFlow variables.
    It reflects the 'capacity' of models.

    Args:
      min_params: Only show profiler nodes holding number parameters
          no less than this.
    Returns:
      self
    """
    self._options['min_params'] = min_params
    return self

  def with_min_occurrence(self, min_occurrence):
    # pylint: disable=line-too-long
    """Only show profiler nodes including no less than 'min_occurrence' graph nodes.

    A "node" means a profiler output node, which can be a python line
    (code view), an operation type (op view), or a graph node
    (graph/scope view). A python line includes all graph nodes created by that
    line, while an operation type includes all graph nodes of that type.

    Args:
      min_occurrence: Only show nodes including no less than this.
    Returns:
      self
    """
    # pylint: enable=line-too-long
    self._options['min_occurrence'] = min_occurrence
    return self

  def with_min_float_operations(self, min_float_ops):
    # pylint: disable=line-too-long
    """Only show profiler nodes consuming no less than 'min_float_ops'.

    Please see https://github.com/tensorflow/tensorflow/tree/master/tensorflow/core/profilerg3doc/profile_model_architecture.md
    on the caveats of calculating float operations.

    Args:
      min_float_ops: Only show profiler nodes with float operations
          no less than this.
    Returns:
      self
    """
    # pylint: enable=line-too-long
    self._options['min_float_ops'] = min_float_ops
    return self

  def with_accounted_types(self, account_type_regexes):
    """Selectively counting statistics based on node types.

    Here, 'types' means the profiler nodes' properties. Profiler by default
    consider device name (e.g. /job:xx/.../gpu:0) and operation type
    (e.g. MatMul) as profiler nodes' properties. User can also associate
    customized 'types' to profiler nodes through OpLogProto proto.

    For example, user can select profiler nodes placed on gpu:0 with:
    `account_type_regexes=['.*gpu:0.*']`

    If none of a node's properties match the specified regexes, the node is
    not displayed nor accounted.

    Args:
      account_type_regexes: A list of regexes specifying the types.
    Returns:
      self.
    """
    self._options['account_type_regexes'] = copy.copy(account_type_regexes)
    return self

  def with_node_names(self,
                      start_name_regexes=None,
                      show_name_regexes=None,
                      hide_name_regexes=None,
                      trim_name_regexes=None):
    """Regular expressions used to select profiler nodes to display.

    After 'with_accounted_types' is evaluated, 'with_node_names' are
    evaluated as follows:

      For a profile data structure, profiler first finds the profiler
      nodes matching 'start_name_regexes', and starts displaying profiler
      nodes from there. Then, if a node matches 'show_name_regexes' and
      doesn't match 'hide_name_regexes', it's displayed. If a node matches
      'trim_name_regexes', profiler stops further searching that branch.

    Args:
      start_name_regexes: list of node name regexes to start displaying.
      show_name_regexes: list of node names regexes to display.
      hide_name_regexes: list of node_names regexes that should be hidden.
      trim_name_regexes: list of node name regexes from where to stop.
    Returns:
      self
    """
    if start_name_regexes is not None:
      self._options['start_name_regexes'] = copy.copy(start_name_regexes)
    if show_name_regexes is not None:
      self._options['show_name_regexes'] = copy.copy(show_name_regexes)
    if hide_name_regexes is not None:
      self._options['hide_name_regexes'] = copy.copy(hide_name_regexes)
    if trim_name_regexes is not None:
      self._options['trim_name_regexes'] = copy.copy(trim_name_regexes)
    return self

  def account_displayed_op_only(self, is_true):
    """Whether only account the statistics of displayed profiler nodes.

    Args:
      is_true: If true, only account statistics of nodes eventually
          displayed by the outputs.
          Otherwise, a node's statistics are accounted by its parents
          as long as it's types match 'account_type_regexes', even if
          it is hidden from the output, say, by hide_name_regexes.
    Returns:
      self
    """
    self._options['account_displayed_op_only'] = is_true
    return self

  def with_empty_output(self):
    """Do not generate side-effect outputs."""
    self._options['output'] = 'none'
    return self

  def with_stdout_output(self):
    """Print the result to stdout."""
    self._options['output'] = 'stdout'
    return self

  def with_file_output(self, outfile):
    """Print the result to a file."""
    self._options['output'] = 'file:outfile=%s' % outfile
    return self

  def with_timeline_output(self, timeline_file):
    """Generate a timeline json file."""
    self._options['output'] = 'timeline:outfile=%s' % timeline_file
    return self

  def order_by(self, attribute):
    # pylint: disable=line-too-long
    """Order the displayed profiler nodes based on a attribute.

    Supported attribute includes micros, bytes, occurrence, params, etc.
    https://github.com/tensorflow/tensorflow/tree/master/tensorflow/core/profiler/g3doc/options.md

    Args:
      attribute: An attribute the profiler node has.
    Returns:
      self
    """
    # pylint: enable=line-too-long
    self._options['order_by'] = attribute
    return self

  def select(self, attributes):
    # pylint: disable=line-too-long
    """Select the attributes to display.

    See https://github.com/tensorflow/tensorflow/tree/master/tensorflow/core/profiler/g3doc/options.md
    for supported attributes.

    Args:
      attributes: A list of attribute the profiler node has.
    Returns:
      self
    """
    # pylint: enable=line-too-long
    self._options['select'] = copy.copy(attributes)
    return self

  def with_step(self, step):
    """Which profile step to use for profiling.

    The 'step' here refers to the step defined by `Profiler.add_step()` API.

    Args:
      step: When multiple steps of profiles are available, select which step's
         profile to use. If -1, use average of all available steps.
    Returns:
      self
    """
    self._options['step'] = step
    return self
