code: def _deduplicate_requirements(requirements):
      """
      De-duplicates a list of pip package requirements, handling complex scenarios such as merging
      extras and combining version constraints.
  
      This function processes a list of pip package requirements and de-duplicates them. It handles
      standard PyPI packages and non-standard requirements (like URLs or local paths). The function
      merges extras and combines version constraints for duplicate packages. The most restrictive
      version specifications or the ones with extras are prioritized. If incompatible version
      constraints are detected, it raises an MlflowException.
  
      Args:
          requirements (list of str): A list of pip package requirement strings.
  
      Returns:
          list of str: A deduplicated list of pip package requirements.
  
      Raises:
          MlflowException: If incompatible version constraints are detected among the provided
                           requirements.
  
      Examples:
          - Input: ["packageA", "packageA==1.0"]
            Output: ["packageA==1.0"]
  
          - Input: ["packageX>1.0", "packageX[extras]", "packageX<2.0"]
            Output: ["packageX[extras]>1.0,<2.0"]
  
          - Input: ["markdown[extra1]>=3.5.1", "markdown[extra2]<4", "markdown"]
            Output: ["markdown[extra1,extra2]>=3.5.1,<4"]
  
          - Input: ["scikit-learn==1.1", "scikit-learn<1"]
            Raises MlflowException indicating incompatible versions.
  
      Note:
          - Non-standard requirements (like URLs or file paths) are included as-is.
          - If a requirement appears multiple times with different sets of extras, they are merged.
          - The function uses `_validate_version_constraints` to check for incompatible version
            constraints by doing a dry-run pip install of a requirements collection.
      """
      deduped_reqs = {}
  
      for req in requirements:
          try:
              parsed_req = Requirement(req)
              base_pkg = parsed_req.name
  
              existing_req = deduped_reqs.get(base_pkg)
  
              if not existing_req:
                  deduped_reqs[base_pkg] = parsed_req
              else:
                  # Verify that there are not unresolvable constraints applied if set and combine
                  # if possible
                  if (
                      existing_req.specifier
                      and parsed_req.specifier
                      and existing_req.specifier != parsed_req.specifier
                  ):
                      _validate_version_constraints(
                          [str(existing_req), req]
                      )
                      parsed_req.specifier = ",".join(
                          [
                              str(existing_req.specifier),
                              str(parsed_req.specifier),
                          ]
                      )
  
                  # Preserve existing specifiers
                  if (
                      existing_req.specifier
                      and not parsed_req.specifier
                  ):
                      parsed_req.specifier = existing_req.specifier
  
                  # Combine and apply extras if specified
                  if (
                      existing_req.extras
                      and parsed_req.extras
                      and existing_req.extras != parsed_req.extras
                  ):
                      parsed_req.extras = sorted(
                          set(existing_req.extras).union(
                              parsed_req.extras
                          )
                      )
                  elif existing_req.extras and not parsed_req.extras:
                      parsed_req.extras = existing_req.extras
  
                  deduped_reqs[base_pkg] = parsed_req
  
          except InvalidRequirement:
              # Include non-standard package strings as-is
              if req not in deduped_reqs:
                  deduped_reqs[req] = req
      return [str(req) for req in deduped_reqs.values()]
  
imports: import logging
  import os
  import re
  import subprocess
  import sys
  import tempfile
  import yaml
  from packaging.requirements import InvalidRequirement, Requirement
  from packaging.version import Version
  from mlflow.environment_variables import _MLFLOW_TESTING
  from mlflow.exceptions import MlflowException
  from mlflow.protos.databricks_pb2 import INVALID_PARAMETER_VALUE
  from mlflow.utils import PYTHON_VERSION, insecure_hash
  from mlflow.utils.process import _exec_cmd
  from mlflow.utils.requirements_utils import _infer_requirements, _parse_requirements
  from mlflow.version import VERSION
label_desc: Use image node_id 16 for calling a global function with example usage: _deduplicate_requirements(requirements) and returns: unknown