由于tensorflow版本問題，在tensorflow2.x版本里沒有contrib組件，因此無法使用LSTMRNN實例中的sequence_loss_by_example函數。

AttributeError: module ‘tensorflow_core.compat.v1’ has no attribute ‘contrib’

解決辦法：找到自己運行代碼的環境下的Lib\site-packages\tensorflow_core，在我的機器上是如下：
C:\Users\Dell\anaconda3\envs\tf_gpu\Lib\site-packages\tensorflow_core

然后在這個文件夾下創建一個新的.py文件，即seq_loss.py文件，里面代碼為
from six.moves import xrange # pylint: disable=redefined-builtin
from six.moves import zip # pylint: disable=redefined-builtin
from tensorflow.python.framework import dtypes
from tensorflow.python.framework import ops
from tensorflow.python.ops import array_ops
from tensorflow.python.ops import control_flow_ops
from tensorflow.python.ops import embedding_ops
from tensorflow.python.ops import math_ops
from tensorflow.python.ops import nn_ops
from tensorflow.python.ops import rnn
from tensorflow.python.ops import rnn_cell_impl
from tensorflow.python.ops import variable_scope
from tensorflow.python.util import nest

def sequence_loss_by_example(logits,
targets,
weights,
average_across_timesteps=True,
softmax_loss_function=None,
name=None):
if len(targets) != len(logits) or len(weights) != len(logits):
raise ValueError("Lengths of logits, weights, and targets must be the same "
“%d, %d, %d.” % (len(logits), len(weights), len(targets)))
with ops.name_scope(name, “sequence_loss_by_example”,
logits + targets + weights):
log_perp_list = []
for logit, target, weight in zip(logits, targets, weights):
if softmax_loss_function is None:
# TODO(irving,ebrevdo): This reshape is needed because
# sequence_loss_by_example is called with scalars sometimes, which
# violates our general scalar strictness policy.
target = array_ops.reshape(target, [-1])
crossent = nn_ops.sparse_softmax_cross_entropy_with_logits(
labels=target, logits=logit)
else:
crossent = softmax_loss_function(labels=target, logits=logit)
log_perp_list.append(crossent * weight)
log_perps = math_ops.add_n(log_perp_list)
if average_across_timesteps:
total_size = math_ops.add_n(weights)
total_size += 1e-12 # Just to avoid division by 0 for all-0 weights.
log_perps /= total_size
return log_perps

這里怎么創建.py文件呢？如下步驟：

然后進去之后

然后把這個文件復制粘貼到C:\Users\Dell\anaconda3\envs\tf_gpu\Lib\site-packages\tensorflow_core下面即可。
然后再LSTMRNN實例代碼添加頭文件
from tensorflow_core import seq_loss
并且將計算損失調用函數語句
losses = tf.contrib.legacy_seq2seq.sequence_loss_by_example
改為
losses = seq_loss.sequence_loss_by_example
即可。
這時候運行的時候可能還有問題是
TypeError: ms_error() got an unexpected keyword argument ‘labels’
這是因為

def ms_error(self, y_target, y_pre):

return tf.square(tf.sub(y_target, y_pre))

這里定義傳入參數的錯誤，改為
def ms_error(self,labels,logits):
return tf.square(tf.subtract(labels,logits))
應該就好了。

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