docstr: Basic validation to protect against some invalid state.
docstr_tok: ["Basic","validation","to","protect","against","some","invalid","state","."]
code: def validate(self):
      """
      Basic validation to protect against some invalid state.
      """
      if not DEBUG:
          return
  
      for op in self.operations:
          for b in op.blocks:
              b.validate()
          if op.outputs is None:
              raise InvalidBlockStateError()
  
          # Check the input output relationships
          # from outputs -> inputs
          for ov in op.outputs:
              child_op_count = Counter(ov.child_ops)
              for next_op, c in child_op_count.items():
                  c_actual = next_op.get_flattened_inputs().count(ov)
                  if c_actual != c:
                      msg = (
                          "Var {} should be consumed by op {} {}"
                          + " times, but op {} uses it {} times.\n{}"
                      )
                      raise InvalidBlockStateError(
                          msg.format(
                              ov.name,
                              next_op.name,
                              c,
                              next_op.name,
                              c_actual,
                              next_op,
                          )
                      )
  
          # from inputs -> outputs
          input_var_count = Counter(op.get_flattened_inputs())
          for iv, c in input_var_count.items():
              c_actual = iv.child_ops.count(op)
              if c_actual != c:
                  msg = (
                      "Var {} should be consumed by op {} {}"
                      + " times, but op {} uses it {} times.\n{}"
                  )
                  raise InvalidBlockStateError(
                      msg.format(
                          iv.name, op.name, c_actual, op.name, c, op
                      )
                  )
  
      # 1 to 1 mapping between Block outputs and Var.consuming_blocks
      for op in self.operations:
          for ov in op.outputs:
              for b in ov.consuming_blocks:
                  if ov not in b.outputs:
                      msg = "Var {} should be output of block {}: {}"
                      raise ValueError(msg.format(ov.name, b.name, b))
  
      for v in self.outputs:
          if self not in v.consuming_blocks:
              msg = "Var {} should be output of block {}: {}"
              raise ValueError(msg.format(ov.name, b.name, b))
  
imports: from collections import Counter, OrderedDict
  import copy
  import logging
  import numpy
  from six import string_types
  from .None import SPACES, types
  from .var import Var, InternalVar, ListVar
  from .visitors.dot_visitor import DotVisitor
  from .types.symbolic import k_used_symbols, k_num_internal_syms, any_symbolic, is_symbolic
  from .input_type import TupleInputType
label_desc: Use image node_id 3 for calling the Block obj's underlying member method code with example usage: obj.validate() without return types