Resets the iterator to the beginning of the data.

def reset(self):
        """Resets the iterator to the beginning of the data."""
        self.curr_idx = 0
        #shuffle data in each bucket
        random.shuffle(self.idx)
        for i, buck in enumerate(self.sentences):
            self.indices[i], self.sentences[i], self.characters[i], self.label[i] = shuffle(self.indices[i],
                                                                                            self.sentences[i],
                                                                                            self.characters[i],
                                                                                            self.label[i])

        self.ndindex = []
        self.ndsent = []
        self.ndchar = []
        self.ndlabel = []

        #for each bucket of data
        for i, buck in enumerate(self.sentences):
            #append the lists with an array
            self.ndindex.append(ndarray.array(self.indices[i], dtype=self.dtype))
            self.ndsent.append(ndarray.array(self.sentences[i], dtype=self.dtype))
            self.ndchar.append(ndarray.array(self.characters[i], dtype=self.dtype))
            self.ndlabel.append(ndarray.array(self.label[i], dtype=self.dtype))