问题描述
我正在尝试读取以FloatList形式存储在tfrecords中的numpy数组。这就是我正在使用的代码
def get_training_dataset():
dataset = load_dataset(TRAINING_FILENAMES)
dataset = dataset.repeat()
dataset = dataset.shuffle(2048)
dataset = dataset.batch(BATCH_SIZE)
dataset = dataset.prefetch(AUTO)
return dataset
def load_dataset(filenames):
tf_op = tf.data.Options()
tf_op.experimental_deterministic = False
dataset = tf.data.TFRecordDataset(filenames,num_parallel_reads=AUTO)
print(dataset)
dataset = dataset.with_options(tf_op)
dataset = dataset.map(read_tfrecord,num_parallel_calls=AUTO)
return dataset
def read_tfrecord(example):
tfrec_format = {
"x" : tf.io.FixedLenFeature([],tf.float32),"y" : tf.io.FixedLenFeature([],tf.float32)
}
print(example)
example = tf.io.parse_single_example(example,tfrec_format)
print(example['y'].shape)
x = tf.reshape(example['x'],[224,224,3])
y = to_categorical(tf.reshape(example['y'],2]),num_classes=32)
y = {"output1":y[:,:,0],"output2":y[:,1]}
return x,y
print("Training data shapes:")
for image,label in get_training_dataset().take(3):
print(image.numpy().shape,label.numpy().shape)
print("Validation data shapes:")
for image,label in get_validation_dataset().take(3):
print(image.numpy().shape,label.numpy().shape)
印刷品的输出是
训练数据形状：
张量（“ args_0：0”，shape =（），dtype = string） （）
为什么形状显示为空？ tfrecords不为空。我也收到以下错误
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-40-53f01a0d2c13> in <module>
1 print("Training data shapes:")
----> 2 for image,label in get_training_dataset().take(3):
3 print(image.numpy().shape,label.numpy().shape)
4 print("Validation data shapes:")
5 for image,label in get_validation_dataset().take(3):
<ipython-input-22-f4dcf023fbcc> in get_training_dataset()
1 def get_training_dataset():
----> 2 dataset = load_dataset(TRAINING_FILENAMES)
3 dataset = dataset.repeat()
4 dataset = dataset.shuffle(2048)
5 dataset = dataset.batch(BATCH_SIZE)
<ipython-input-39-16e1046af942> in load_dataset(filenames)
5 print(dataset)
6 dataset = dataset.with_options(tf_op)
----> 7 dataset = dataset.map(read_tfrecord,num_parallel_calls=AUTO)
8
9 return dataset
/opt/conda/lib/python3.7/site-packages/tensorflow/python/data/ops/dataset_ops.py in map(self,map_func,num_parallel_calls,deterministic)
1626 num_parallel_calls,1627 deterministic,-> 1628 preserve_cardinality=True)
1629
1630 def flat_map(self,map_func):
/opt/conda/lib/python3.7/site-packages/tensorflow/python/data/ops/dataset_ops.py in __init__(self,input_dataset,deterministic,use_inter_op_parallelism,preserve_cardinality,use_legacy_function)
4018 self._transformation_name(),4019 dataset=input_dataset,-> 4020 use_legacy_function=use_legacy_function)
4021 if deterministic is None:
4022 self._deterministic = "default"
/opt/conda/lib/python3.7/site-packages/tensorflow/python/data/ops/dataset_ops.py in __init__(self,func,transformation_name,dataset,input_classes,input_shapes,input_types,input_structure,add_to_graph,use_legacy_function,defun_kwargs)
3219 with tracking.resource_tracker_scope(resource_tracker):
3220 # Todo(b/141462134): Switch to using garbage collection.
-> 3221 self._function = wrapper_fn.get_concrete_function()
3222
3223 if add_to_graph:
/opt/conda/lib/python3.7/site-packages/tensorflow/python/eager/function.py in get_concrete_function(self,*args,**kwargs)
2530 """
2531 graph_function = self._get_concrete_function_garbage_collected(
-> 2532 *args,**kwargs)
2533 graph_function._garbage_collector.release() # pylint: disable=protected-access
2534 return graph_function
/opt/conda/lib/python3.7/site-packages/tensorflow/python/eager/function.py in _get_concrete_function_garbage_collected(self,**kwargs)
2494 args,kwargs = None,None
2495 with self._lock:
-> 2496 graph_function,args,kwargs = self._maybe_define_function(args,kwargs)
2497 if self.input_signature:
2498 args = self.input_signature
/opt/conda/lib/python3.7/site-packages/tensorflow/python/eager/function.py in _maybe_define_function(self,kwargs)
2775
2776 self._function_cache.missed.add(call_context_key)
-> 2777 graph_function = self._create_graph_function(args,kwargs)
2778 self._function_cache.primary[cache_key] = graph_function
2779 return graph_function,kwargs
/opt/conda/lib/python3.7/site-packages/tensorflow/python/eager/function.py in _create_graph_function(self,kwargs,override_flat_arg_shapes)
2665 arg_names=arg_names,2666 override_flat_arg_shapes=override_flat_arg_shapes,-> 2667 capture_by_value=self._capture_by_value),2668 self._function_attributes,2669 # Tell the ConcreteFunction to clean up its graph once it goes out of
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/func_graph.py in func_graph_from_py_func(name,python_func,signature,func_graph,autograph,autograph_options,add_control_dependencies,arg_names,op_return_value,collections,capture_by_value,override_flat_arg_shapes)
979 _,original_func = tf_decorator.unwrap(python_func)
980
--> 981 func_outputs = python_func(*func_args,**func_kwargs)
982
983 # invariant: `func_outputs` contains only Tensors,CompositeTensors,/opt/conda/lib/python3.7/site-packages/tensorflow/python/data/ops/dataset_ops.py in wrapper_fn(*args)
3212 attributes=defun_kwargs)
3213 def wrapper_fn(*args): # pylint: disable=missing-docstring
-> 3214 ret = _wrapper_helper(*args)
3215 ret = structure.to_tensor_list(self._output_structure,ret)
3216 return [ops.convert_to_tensor(t) for t in ret]
/opt/conda/lib/python3.7/site-packages/tensorflow/python/data/ops/dataset_ops.py in _wrapper_helper(*args)
3154 nested_args = (nested_args,)
3155
-> 3156 ret = autograph.tf_convert(func,ag_ctx)(*nested_args)
3157 # If `func` returns a list of tensors,`nest.flatten()` and
3158 # `ops.convert_to_tensor()` would conspire to attempt to stack
/opt/conda/lib/python3.7/site-packages/tensorflow/python/autograph/impl/api.py in wrapper(*args,**kwargs)
263 except Exception as e: # pylint:disable=broad-except
264 if hasattr(e,'ag_error_Metadata'):
--> 265 raise e.ag_error_Metadata.to_exception(e)
266 else:
267 raise
ValueError: in user code:
<ipython-input-37-7bad4da2b4f1>:9 read_tfrecord *
x = tf.reshape(example['x'],3])
/opt/conda/lib/python3.7/site-packages/tensorflow/python/ops/array_ops.py:193 reshape **
result = gen_array_ops.reshape(tensor,shape,name)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/ops/gen_array_ops.py:8087 reshape
"Reshape",tensor=tensor,shape=shape,name=name)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/op_def_library.py:744 _apply_op_helper
attrs=attr_protos,op_def=op_def)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/func_graph.py:595 _create_op_internal
compute_device)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/ops.py:3327 _create_op_internal
op_def=op_def)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/ops.py:1817 __init__
control_input_ops,op_def)
/opt/conda/lib/python3.7/site-packages/tensorflow/python/framework/ops.py:1657 _create_c_op
raise ValueError(str(e))
ValueError: Cannot reshape a tensor with 1 elements to shape [224,3] (150528 elements) for '{{node Reshape}} = Reshape[T=DT_FLOAT,Tshape=DT_INT32](ParseSingleExample/ParseExample/ParseExampleV2,Reshape/shape)' with input shapes: [],[3] and with input tensors computed as partial shapes: input[1] = [224,3].
我在做什么错？我是tfrecords的新手，请帮助 这是我正在使用的数据集https://www.kaggle.com/gameatro/colorization-data
解决方法
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