word_counts_top = word_counts_top.most_common(100) AttributeError: 'dict' object has no attribute 'most_common'怎么改正

`most_common()` 是 `collections.Counter` 类的方法，而你的 `word_counts_top` 是一个字典对象。所以你需要将其先转换成 `collections.Counter` 类型，再调用 `most_common()` 方法。可以按照以下方式修改代码：

import collections

word_counts_top = collections.Counter(word_counts_top)
word_counts_top = word_counts_top.most_common(100)

这样就可以正常使用 `most_common()` 方法了。

相关问题

def predict_from_naive_bayes_model(model, matrix): """Use a Naive Bayes model to compute predictions for a target matrix. This function should be able to predict on the models that fit_naive_bayes_model outputs. Args: model: A trained model from fit_naive_bayes_model matrix: A numpy array containing word counts Returns: A numpy array containg the predictions from the model """ # *** START CODE HERE *** log_probabilities = [] for i in range(model.num_classes): log_probabilities.append(np.sum(matrix * model.log_class_priors[i] + model.log_likelihoods[i])) return np.argmax(log_probabilities) # Return the class with the highest probability # *** END CODE HERE ***代码报错AttributeError: 'dict' object has no attribute 'log_class_priors'请帮我修改

根据报错信息，我们可以看出，`model` 参数传入的是一个字典，而字典没有 `log_class_priors` 属性。因此，我们需要修改这个函数，使其能够处理字典作为输入。具体的修改方法如下：

def predict_from_naive_bayes_model(model, matrix):
    """Use a Naive Bayes model to compute predictions for a target matrix. This function should be able to predict on the models that fit_naive_bayes_model outputs.

    Args:
    model: A trained model from fit_naive_bayes_model
    matrix: A numpy array containing word counts

    Returns:
    A numpy array containing the predictions from the model
    """
    
    # *** START CODE HERE ***
    log_probabilities = []
    for i in range(model['num_classes']):
        log_probabilities.append(np.sum(matrix * model['log_class_priors'][i] + model['log_likelihoods'][i]))
    return np.argmax(log_probabilities) # Return the class with the highest probability
    # *** END CODE HERE ***

在这个修改后的函数中，我们使用了 `model['log_class_priors']` 和 `model['log_likelihoods']` 来获取训练得到的朴素贝叶斯模型的参数，这些参数存储在字典 `model` 中。同时，我们也使用了 `model['num_classes']` 来获取模型中的类别数目。