<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_file_tracebacks(self, file_path):
 """Get the lists of ops created at lines of a specified source file. Args: file_path: Path to the source file. Returns: A dict mapping line number to a list of 2-tuples, `(op_name, stack_position)` `op_name` is the name of the name of the op whose creation traceback includes the line. `stack_position` is the position of the line in the op's creation traceback, represented as a 0-based integer. Raises: ValueError: If `file_path` does not point to a source file that has been received by this instance of `SourceManager`. """

    if file_path not in self._source_file_content:
      raise ValueError(
          'Source file of path "%s" has not been received by this instance of '
          'SourceManager.' % file_path)

    lineno_to_op_names_and_stack_position = dict()
    for op_log_entry in self._graph_traceback.log_entries:
      for stack_pos, trace in enumerate(op_log_entry.code_def.traces):
        if self._graph_traceback.id_to_string[trace.file_id] == file_path:
          if trace.lineno not in lineno_to_op_names_and_stack_position:
            lineno_to_op_names_and_stack_position[trace.lineno] = []
          lineno_to_op_names_and_stack_position[trace.lineno].append(
              (op_log_entry.name, stack_pos))
    return lineno_to_op_names_and_stack_position