The program always executes behavior clone when running CQLLearner.

[jiangjiadi]

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When I run the cql algorithm, I found the algorithm only execute behavior clone. I checked the config used. The training step is 100 and the 'num_bc_iters' is set to 50. When I further dive to the source code of CQLLearner, I found the 'counts' in function 'step' has two keys "steps" and "walltime". However, in the inplementation of 'step', the key used is "learner_steps". The invalid key "learner_steps" makes the "cur_step" always be 0, thus causing the algorithm only execute behavior clone. When I correct the key "learner_steps" to "steps", the problem is solved.