# How to fix the error w.r.t flat.reshape? **URL:** \ **Category:** RLlib\ **Created:** [August 16, 2021, 9:34am UTC](https://discuss.ray.io/t/how-to-fix-the-error-w-r-t-flat-reshape/3259 "2021-08-16T09:34:16Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Xim\_Lee](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/xim_lee/32/300_2.png) [@Xim\_Lee](https://discuss.ray.io/u/Xim_Lee)\ **Post date:** [August 16, 2021, 9:34am UTC](https://discuss.ray.io/t/how-to-fix-the-error-w-r-t-flat-reshape/3259/1 "2021-08-16T09:34:16Z")
Hi everybody! I got the error message I don’t know what is the problem… How to fix below the error? ```auto File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/trial_runner.py", line 471, in _process_trial result = self.trial_executor.fetch_result(trial) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/ray_trial_executor.py", line 430, in fetch_result result = ray.get(trial_future[0], DEFAULT_GET_TIMEOUT) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/worker.py", line 1538, in get raise value.as_instanceof_cause() ray.exceptions.RayTaskError(ValueError): ray::TD3.train() (pid=2401, ip=10.27.24.146) File "python/ray/_raylet.pyx", line 479, in ray._raylet.execute_task File "python/ray/_raylet.pyx", line 432, in ray._raylet.execute_task.function_executor File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer.py", line 522, in train raise e File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer.py", line 508, in train result = Trainable.train(self) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/trainable.py", line 332, in train result = self.step() File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer_template.py", line 110, in step res = next(self.train_exec_impl) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 758, in __next__ return next(self.built_iterator) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 785, in apply_foreach for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 845, in apply_filter for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 845, in apply_filter for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 785, in apply_foreach for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 845, in apply_filter for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 1078, in build_union item = next(it) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 758, in __next__ return next(self.built_iterator) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 785, in apply_foreach for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 785, in apply_foreach for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 785, in apply_foreach for item in it: File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/util/iter.py", line 793, in apply_foreach result = fn(item) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/execution/rollout_ops.py", line 81, in .for_each(lambda batches: SampleBatch.concat_samples(batches)) \ File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/policy/sample_batch.py", line 93, in concat_samples out[k] = concat_aligned([s[k] for s in samples]) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/utils/memory.py", line 68, in concat_aligned output = flat.reshape(new_shape) ValueError: cannot reshape array of size 388 into shape (30,14) ``` ---
**Author:** ![Xim\_Lee](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/xim_lee/32/300_2.png) [@Xim\_Lee](https://discuss.ray.io/u/Xim_Lee)\ **Post date:** [August 17, 2021, 2:48am UTC](https://discuss.ray.io/t/how-to-fix-the-error-w-r-t-flat-reshape/3259/2 "2021-08-17T02:48:10Z")
It’s my data type. ```auto (pid=14431) tensor([[-1.0000, 0.0999, 0.0999, -1.0000, 0.0997, 0.1000, 0.0999, -1.0000, (pid=14431) 0.0282, 0.0992, -1.0000, -0.1147, -0.2561, 0.0000]]) Shape of outputs: torch.Size([1, 14]) num_outputs:14 ``` I reckon that this is the right shape, but Terminal put the error message below. What is the problme? ```auto File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/ddpg/ddpg_tf_policy.py", line 90, in get_distribution_inputs_and_class }, [], None) File "/home/bmil/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/models/modelv2.py", line 219, in __call__ self.num_outputs, shape)) ``` ```auto outputs, state = res # print(outputs, outputs.shape, self.num_outputs) try: shape = outputs.shape except AttributeError: raise ValueError("Output is not a tensor: {}".format(outputs)) else: if len(shape) != 2 or int(shape[1]) != self.num_outputs: raise ValueError( "Expected output shape of [None, {}], got {}".format( self.num_outputs, shape)) if not isinstance(state, list): raise ValueError("State output is not a list: {}".format(state)) self._last_output = outputs return outputs, state ``` ---
**Author:** ![sven1977](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/sven1977/32/53_2.png) [@sven1977](https://discuss.ray.io/u/sven1977)\ **Post date:** [August 18, 2021, 7:36am UTC](https://discuss.ray.io/t/how-to-fix-the-error-w-r-t-flat-reshape/3259/3 "2021-08-18T07:36:12Z")
Hey @Xim_Lee , could you post a short reproduction script here so I can debug your issue? Thanks! 🙂