message: Provide better debug information on true_classes assertion
diff: @@ -44,9 +44,11 @@ class BaseCandidateSamplerOp : public OpKernel {
  OP_REQUIRES(context, true_classes.dims() == 2,
  errors::InvalidArgument("true_classes must be a matrix"));
  const int32 batch_size = true_classes.dim_size(0);
  - OP_REQUIRES(context, true_classes.dim_size(1) == num_true_,
  + OP_REQUIRES(
  + context, true_classes.dim_size(1) == num_true_,
  errors::InvalidArgument("true_classes must have "
  - "num_true columns"));
  + "num_true columns, expected: ",
  + true_classes.dim_size(1), " was: ", num_true_));
  CHECK(sampler_) << "CandidateSamplerOp did not set sampler_";
  if (unique_) {
  