create symbolic array

该文介绍了一种使用MATLAB创建符号数组的方法。通过加载地标数据并为每个地标定义12个符号变量,最终组合成一个大的符号数组。此过程涉及循环和字符串格式设置。
%%%%% create symbolic array

load('landmarks','landmarks');
nlandmarks = numel(landmarks);

x = sym(zeros(nlandmarks*12,1));

for i =  1 : nlandmarks
    array = sym(zeros(12,1));
    for j = 1:12
        array(j) = sym(sprintf('x_%d_%d',i,j));
    end
    x((i-1)*12 + 1:i*12) = array;
end

NotImplementedError: Cannot convert a symbolic Tensor (lstm_3/strided_slice:0) to a numpy array. --------------------------------------------------------------------------- NotImplementedError Traceback (most recent call last) Cell In[24], line 5 2 start_time = time.time() 4 # 选择要训练的模型类型(rnn/lstm/gru) ----> 5 train_model(model_type='lstm') 7 # 计算总耗时 8 total_time = time.time() - start_time Cell In[21], line 12, in train_model(model_type) 10 model = build_gru_model() 11 else: # 默认使用LSTM ---> 12 model = build_lstm_model() 13 # 打印模型结构 14 model.summary() Cell In[23], line 8, in build_lstm_model() 6 inputs = Input(shape=(max_review_len,)) 7 x = layers.Embedding(total_words, embedding_len)(inputs) ----> 8 x = layers.LSTM(64, return_sequences=False)(x) 9 outputs = layers.Dense(1, activation='sigmoid')(x) 10 model = Model(inputs=inputs, outputs=outputs) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:623, in RNN.__call__(self, inputs, initial_state, constants, **kwargs) 617 inputs, initial_state, constants = _standardize_args(inputs, 618 initial_state, 619 constants, 620 self._num_constants) 622 if initial_state is None and constants is None: --> 623 return super(RNN, self).__call__(inputs, **kwargs) 625 # If any of `initial_state` or `constants` are specified and are Keras 626 # tensors, then add them to the inputs and temporarily modify the 627 # input_spec to include them. 629 additional_inputs = [] File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/engine/base_layer.py:854, in Layer.__call__(self, inputs, *args, **kwargs) 852 outputs = base_layer_utils.mark_as_return(outputs, acd) 853 else: --> 854 outputs = call_fn(cast_inputs, *args, **kwargs) 856 except errors.OperatorNotAllowedInGraphError as e: 857 raise TypeError('You are attempting to use Python control ' 858 'flow in a layer that was not declared to be ' 859 'dynamic. Pass `dynamic=True` to the class ' 860 'constructor.\nEncountered error:\n"""\n' + 861 str(e) + '\n"""') File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:2548, in LSTM.call(self, inputs, mask, training, initial_state) 2546 self.cell.reset_dropout_mask() 2547 self.cell.reset_recurrent_dropout_mask() -> 2548 return super(LSTM, self).call( 2549 inputs, mask=mask, training=training, initial_state=initial_state) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:681, in RNN.call(self, inputs, mask, training, initial_state, constants) 675 def call(self, 676 inputs, 677 mask=None, 678 training=None, 679 initial_state=None, 680 constants=None): --> 681 inputs, initial_state, constants = self._process_inputs( 682 inputs, initial_state, constants) 684 if mask is not None: 685 # Time step masks must be the same for each input. 686 # TODO(scottzhu): Should we accept multiple different masks? 687 mask = nest.flatten(mask)[0] File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:798, in RNN._process_inputs(self, inputs, initial_state, constants) 796 initial_state = self.states 797 else: --> 798 initial_state = self.get_initial_state(inputs) 800 if len(initial_state) != len(self.states): 801 raise ValueError('Layer has ' + str(len(self.states)) + 802 ' states but was passed ' + str(len(initial_state)) + 803 ' initial states.') File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:605, in RNN.get_initial_state(self, inputs) 603 dtype = inputs.dtype 604 if get_initial_state_fn: --> 605 init_state = get_initial_state_fn( 606 inputs=None, batch_size=batch_size, dtype=dtype) 607 else: 608 init_state = _generate_zero_filled_state(batch_size, self.cell.state_size, 609 dtype) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:2313, in LSTMCell.get_initial_state(self, inputs, batch_size, dtype) 2312 def get_initial_state(self, inputs=None, batch_size=None, dtype=None): -> 2313 return list(_generate_zero_filled_state_for_cell( 2314 self, inputs, batch_size, dtype)) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:2752, in _generate_zero_filled_state_for_cell(cell, inputs, batch_size, dtype) 2750 batch_size = array_ops.shape(inputs)[0] 2751 dtype = inputs.dtype -> 2752 return _generate_zero_filled_state(batch_size, cell.state_size, dtype) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:2768, in _generate_zero_filled_state(batch_size_tensor, state_size, dtype) 2765 return array_ops.zeros(init_state_size, dtype=dtype) 2767 if nest.is_sequence(state_size): -> 2768 return nest.map_structure(create_zeros, state_size) 2769 else: 2770 return create_zeros(state_size) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/util/nest.py:536, in map_structure(func, *structure, **kwargs) 532 flat_structure = [flatten(s, expand_composites) for s in structure] 533 entries = zip(*flat_structure) 535 return pack_sequence_as( --> 536 structure[0], [func(*x) for x in entries], 537 expand_composites=expand_composites) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/util/nest.py:536, in <listcomp>(.0) 532 flat_structure = [flatten(s, expand_composites) for s in structure] 533 entries = zip(*flat_structure) 535 return pack_sequence_as( --> 536 structure[0], [func(*x) for x in entries], 537 expand_composites=expand_composites) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/keras/layers/recurrent.py:2765, in _generate_zero_filled_state.<locals>.create_zeros(unnested_state_size) 2763 flat_dims = tensor_shape.as_shape(unnested_state_size).as_list() 2764 init_state_size = [batch_size_tensor] + flat_dims -> 2765 return array_ops.zeros(init_state_size, dtype=dtype) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/ops/array_ops.py:2338, in zeros(shape, dtype, name) 2334 if not isinstance(shape, ops.Tensor): 2335 try: 2336 # Create a constant if it won't be very big. Otherwise create a fill op 2337 # to prevent serialized GraphDefs from becoming too large. -> 2338 output = _constant_if_small(zero, shape, dtype, name) 2339 if output is not None: 2340 return output File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/ops/array_ops.py:2295, in _constant_if_small(value, shape, dtype, name) 2293 def _constant_if_small(value, shape, dtype, name): 2294 try: -> 2295 if np.prod(shape) < 1000: 2296 return constant(value, shape=shape, dtype=dtype, name=name) 2297 except TypeError: 2298 # Happens when shape is a Tensor, list with Tensor elements, etc. File <__array_function__ internals>:180, in prod(*args, **kwargs) File /opt/conda/lib/python3.8/site-packages/numpy/core/fromnumeric.py:3088, in prod(a, axis, dtype, out, keepdims, initial, where) 2970 @array_function_dispatch(_prod_dispatcher) 2971 def prod(a, axis=None, dtype=None, out=None, keepdims=np._NoValue, 2972 initial=np._NoValue, where=np._NoValue): 2973 """ 2974 Return the product of array elements over a given axis. 2975 (...) 3086 10 3087 """ -> 3088 return _wrapreduction(a, np.multiply, 'prod', axis, dtype, out, 3089 keepdims=keepdims, initial=initial, where=where) File /opt/conda/lib/python3.8/site-packages/numpy/core/fromnumeric.py:86, in _wrapreduction(obj, ufunc, method, axis, dtype, out, **kwargs) 83 else: 84 return reduction(axis=axis, out=out, **passkwargs) ---> 86 return ufunc.reduce(obj, axis, dtype, out, **passkwargs) File /opt/conda/lib/python3.8/site-packages/tensorflow_core/python/framework/ops.py:735, in Tensor.__array__(self) 734 def __array__(self): --> 735 raise NotImplementedError("Cannot convert a symbolic Tensor ({}) to a numpy" 736 " array.".format(self.name)) NotImplementedError: Cannot convert a symbolic Tensor (lstm_3/strided_slice:0) to a numpy array. + Code
06-22
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