The anatools Package
The anatools package provides the base set of capabilities to build a channel. It includes the software development kit (SDK), the ana interpreter, development utilities, and a set of libraries and nodes that can be included in a channel. It is required for all channels and is installed by including it in the requirements.txt file in the main channel directory.
Nodes in anatools
The nodes in the anatools package are general purpose capabilities that can be included in any channel. To include an anatools node, you add it to the “add_nodes” section of the channel file as follows:
In the above example, the “RandomUniform” node is included in the channel. Note the category, subcategory, and color for the node are also specified. These override the default values.
Following are descriptions of each node in the anatools package
ConditionalSelector
The ConditionalSelector node combines two inputs with an operator and evaluates it as a logical expression. If the result is true then it outputs the value of its ‘True’ input. If the result is false then it outputs the value of its ‘False’ input.
Inputs
ConditionA - A numeric value that is the first operand of the expression.
Operator - A string representing the comparison operator. This can be one of three values - ‘Less Than’, ‘Equal To’, or ‘Greater Than’.
ConditionB - A numeric value that is the second operand of the expression
True - The value to be output if the expression evaluates as true.
False - The value to be output if the expression evaluates as false.
Outputs
Value - The output value
RandomChoice
Selects the specified number of choices from a list. The “List_of_Choices” is a list where each element is one of the choices. Note that if elements are strings then they must each be enclosed in double-quotes, e.g. [“choice1”, “choice2”, “choice3”].
Inputs
List_of_Choices - The list of choices to choose from
Number_of_Choices - The number of choices to make
Unique_Choices - Determines if every choice needs to be unique. This value is a string and can be either ‘True’ or ‘False’.
Outputs
Choices - The list of choices made
RandomNormal
Draw random samples from a normal (Gaussian) distribution with mean 'loc' and standard deviation 'scale'. This node calls the numpy function numpy.random.normal.
Inputs
loc - The mean of the distribution
scale - The standard deviation of the distribution
size - The output shape. If you are drawing a single sample then leave this empty. If you are drawing multiple samples then see the numpy documentation for details.
Outputs
out - The sample(s)
RandomRandint
Generate random integers from low (inclusive) to high (exclusive). This node calls the numpy function numpy.random.randint.
Note the upper bound is exclusive so if you want, for example, to generate random integers between 0 and 9 the low should be set to 0 and the high should be set to 10.
Inputs
low - Lower boundary of the interval (inclusive)
high - Upper boundary of the interval (exclusive)
size - The output shape. If you are drawing a single sample then leave this empty. If you are drawing multiple samples then see the numpy documentation for details.
Outputs
out - The sample(s)
RandomTriangular
Draw random samples from a triangular distribution over the closed interval [left, right]. This node calls the numpy function numpy.random.triangular.
Inputs
left - The lower limit
mode - The value where the peak of the distribution occurs
right - The upper limit
size - The output shape. If you are drawing a single sample then leave this empty. If you are drawing multiple samples then see the numpy documentation for details.
Outputs
out - The sample(s)
RandomUniform
Draw random samples from a uniform distribution over the half-open interval [low, high). This node calls the numpy function numpy.random.uniform.
Inputs
low - Lower boundary of the interval (inclusive)
high - Upper boundary of the interval (exclusive)
size - The output shape. If you are drawing a single sample then leave this empty. If you are drawing multiple samples then see the numpy documentation for details.
Outputs
out - The sample(s)
SelectGenerator
The SelectGenerator node allows the user to create a multi-branch junction in a generator tree. When evaluating the generator tree, one of the weighted input branches will be randomly selected.
Inputs
Generators - Links from one or more generator or modifier nodes. These are ‘downstream’ links in the generator tree.
Outputs
Generator - The ‘upstream’ link in the generator tree.
SetInstanceCount
Set the count property of an input generator to produce multiple instances. Note generator instance count must be implemented in the channel for this to work. Many common channels, such as the example channel, do not support generator instance count.
Inputs
Generator - Link from a generator node.
Count - The number of times to instance the input generator
Outputs
Generator - The generator with the instance count set
String
The String node allows the user to enter a single string and use it as input to multiple nodes
Inputs
String - The string to be passed to other nodes
Outputs
String - The string
SweepArange
Generates a value from a parameter sweep across evenly spaced values within the half-open interval [start,stop). The range of values in the interval is determined by the numpy function numpy.arange. The value drawn from this sequence is determined by taking the current run number modulo the number of values in the sequence and using that as an index into the sequence, e.g. seq[run_num % len(seq)].
For example if start is 0, stop is 10, and step is 1 then the sequence will be [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]. If the run number is 3 then the node will output a value of 3. If the run number is 11 then the output will be 1.
Inputs
start - Start of the interval (inclusive)
stop - End of the interval (exclusive)
step - Spacing between values
Outputs
value - Value drawn from the sequence.
SweepLinspace
Generates a value from a parameter sweep across evenly spaced values within the interval [start,stop]. The range of values in the interval is determined by the numpy function numpy.linspace. The value drawn from this sequence is determined by taking the current run number modulo the number of values in the sequence (num) and using that as an index into the sequence, e.g. seq[run_num % num].
For example if start is 0, stop is 9, and num is 10 then the sequence will be [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]. If the run number is 3 then the node will output a value of 3. If the run number is 11 then the output will be 1.
Inputs
start - Start of the interval (inclusive)
stop - End of the interval (inclusive)
num - Number of values in the sequence
Outputs
value - Value drawn from the sequence.
Value
The Value node allows the user to enter a single numeric value and use it as input to multiple nodes
Inputs
Value - The value to be passed to other nodes
Outputs
Value - The value
Vector2D
Creates a 2D vector with the magnitudes specified.
Inputs
x - The magnitude in the x direction
y - The magnitude in the y direction
Outputs
Vector - The vector represented as a 2 element list
Vector3D
Creates a 3D vector with the magnitudes specified.
Inputs
x - The magnitude in the x direction
y - The magnitude in the y direction
z - The magnitude in the z direction
Outputs
Vector - The vector represented as a 3 element list
VolumeFile
A node that represents a file on a workspace volume that was selected by the user.
Outputs
File - A pointer to the file on the workspace volume. This is an instance of the FileObject class.
Weight
The Weight node modifies the weight of a branch in the generator tree.
Inputs
Generator - Link from a generator node. This is a ‘downstream’ link in the generator tree.
Weight - A numeric weight to be applied to the input branch
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