this is done by returning a tuple. A tuple is a collection of values separated by commas and enclosed in parentheses. For example, a function that calculates the average and standard deviation of a list of numbers could return a tuple containing both values. ...
| 任何类型→浮点 |float( )|wholenumber=522``floatnumber=float(wholenumber)``print(floatnumber)| | 整数或浮点→字符串 |str( )|float_variable=float(2.15)``string_variable=str(float_variable)``print(string_variable)| | 字符串→列表 |列表()|greeting="Hello"``a_list=list(greeting)``print(...
August 20, 2024 29 min read Back To Basics, Part Uno: Linear Regression and Cost Function Data Science An illustrated guide on essential machine learning concepts Shreya Rao February 3, 2023 6 min read Must-Know in Statistics: The Bivariate Normal Projection Ex...
For example, if you are writing to an Amazon S3 bucket, instead of hard-coding the bucket name you are writing to, configure the bucket name as an environment variable. Avoid using recursive invocations in your Lambda function, where the function invokes itself or initiates a process that may...
Iterables can be used in a for loop and in many other places where a sequence is needed (zip(), map(), …). When an iterable object is passed as an argument to the built-in function iter(), it returns an iterator for the object. This iterator is good for one pass over the set...
DataFrame.lookup(row_labels, col_labels) #Label-based “fancy indexing” function for DataFrame. DataFrame.pop(item) #返回删除的项目 DataFrame.tail([n]) #返回最后n行 DataFrame.xs(key[, axis, level, drop_level]) #Returns a cross-section (row(s) or column(s)) from the Series/DataFrame....
logging.basicConfig(level=logging.INFO,format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')logger=logging.getLogger(__name__)defmain():ts=time()client_id=os.getenv('IMGUR_CLIENT_ID')ifnot client_id:raiseException("Couldn't find IMGUR_CLIENT_ID environment variable!")downlo...
# Function Scope x = 5 def set_x(num): # Local var x not the same as global variable x x = num # => 43 print(x) # => 43 def set_global_x(num): global x print(x) # => 5 x = num # global var x is now set to 6 ...
Variable scope formal parameter gets bound to the value of actual parameter when function is called new scope / frame / environment created when enter a function scope is mapping of names to objects def f(x): x = x + 1 print('in f(x): x = ', x) return x x=3z=f(x) 说明1...
model = MNISTClassifier() loss_function = nn.NLLLoss() opt = optim.Adam(model.parameters(), lr=0.001) 我们将MNISTClassifier类的实例初始化为模型。 我们还将的损失定义为负对数似然损失: 代码语言:javascript 代码运行次数:0 运行 复制 Loss(y) = -log(y) 假设我们的图像为 7。如果我们以概率 1 预...