|  | @@ -74,7 +74,7 @@ class GradientCheckingCostFunction : public CostFunction {
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				|  |  |          relative_precision_(relative_precision),
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				|  |  |          extra_info_(extra_info),
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				|  |  |          callback_(callback) {
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				|  |  | -    CHECK_NOTNULL(callback_);
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				|  |  | +    CHECK(callback_ != nullptr);
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				|  |  |      const vector<int32_t>& parameter_block_sizes =
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				|  |  |          function->parameter_block_sizes();
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				|  |  |      *mutable_parameter_block_sizes() = parameter_block_sizes;
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