dictionary

问题 I have a dictionary with many entries and a huge vector as values. These vectors can be 60.000 dimensions large and I have about 60.000 entries in the dictionary. To save time, I want to store this after computation. However, using a pickle led to a huge file. I have tried storing to JSON, but the file remains extremely large (like 10.5 MB on a sample of 50 entries with less dimensions). I have also read about sparse matrices. As most entries will be 0, this is a possibility. Will this reduce

问题 I would like to retrieve the original object of a key in a HashMap in Java, what is the best way to do it? For example HashMap<Integer, Integer> map = new HashMap<Integer, Integer>(); Integer keyObj = new Integer(10); Integer valueObj = new Integer(100); // And add maybe 1 million other key value pairs here //... later in the code, if I want to retrieve the valueObj, given the value of a key to be 10 Integer retrievedValueObj = map.get(10); //is there a way to retrieve the original keyObj

问题 I'm creating a dictionary d of one million of items which are tuples, and ideally I'd like to access them with: d[1634].id # or d[1634]['id'] d[1634].name # or d[1634]['name'] d[1634].isvalid # or d[1634]['isvalid'] rather than d[1634][0] , d[1634][1] , d[1634][2] which is less explicit. According to my test: import os, psutil, time, collections, typing Tri = collections.namedtuple('Tri', 'id,name,isvalid') Tri2 = typing.NamedTuple("Tri2", [('id', int), ('name', str), ('isvalid', bool)]) t0 =

问题 I'm creating a dictionary d of one million of items which are tuples, and ideally I'd like to access them with: d[1634].id # or d[1634]['id'] d[1634].name # or d[1634]['name'] d[1634].isvalid # or d[1634]['isvalid'] rather than d[1634][0] , d[1634][1] , d[1634][2] which is less explicit. According to my test: import os, psutil, time, collections, typing Tri = collections.namedtuple('Tri', 'id,name,isvalid') Tri2 = typing.NamedTuple("Tri2", [('id', int), ('name', str), ('isvalid', bool)]) t0 =

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':

问题 I have a list of dicts as follows: [{'ppm_error': -5.441115144810845e-07, 'key': 'Y7', 'obs_ion': 1054.5045550349998}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1047.547178035}, {'ppm_error': 2.3119997582222951e-07, 'key': 'Y9', 'obs_ion': 1381.24928035}, {'ppm_error': -2.5532659838679713e-06, 'key': 'Y4', 'obs_ion': 741.339467035}, {'ppm_error': 1.3036219678359603e-05, 'key': 'Y10', 'obs_ion': 1349.712302035}, {'ppm_error': 3.4259216556970878e-06, 'key': 'Y6', 'obs_ion':