Selasa, 31 Agustus 2021
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tags on the client, and segmenting these into preprocessed chunks (2) Performing inference on question-generation with a T5-base model pretrained on SQuAD (3) Extractive question-answering with the chunk & question we've generated with RoBERTa, also pretrained on SQuAD. No GPT-3 here— where's the fun in an API call when you can do it yourself. Ferret is built as a React.JS app deployed as a chrome extension, with models hosted on AWS Sagemaker. Finally, why could this be helpful? Human memory is lossy. Psychologists have shown for forever that your memory can be modeled with a forgetting curve. If you don't attempt to retain knowledge, you'll likely lose it. But most of the content we read online (technical blog posts, documentation, course notes, articles) gets ingested and quickly forgotten. We're interested in low-friction approaches to helping people better remember this content , starting with fellow engineers who depend on their ability to remember key concepts to do the best job. We've open-sourced the full repo and are actively responding to PRs + issues. [3]. You can read more about the technical + product challenges we faced if that interests you as well. [4] We appreciate all feedback and suggestions! [1]https://ift.tt/3n02UqT [2] https://ift.tt/3zAr5iU [3] https://ift.tt/2WFb0K0 [4] https://ift.tt/38wYuyV August 31, 2021 at 03:00AM
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Sabtu, 28 Agustus 2021
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Selasa, 24 Agustus 2021
29 Sunset Improvement Project Relaunched
By Shalon Rogers
Improvements are on the horizon for one of the longest bus routes in the Muni system. As part of the 29 Sunset Improvement Project, the SFMTA is conducting a survey to gather feedback and ideas on how to improve the 29 Sunset.
At the beginning of 2020, the SFMTA’s 29 Sunset Improvement Project was ready to kick-off a year-long outreach program. However, the COVID-19 pandemic delayed the project and priorities were shifted to developing and implementing Temporary Emergency Transit Lanes (TETL) and service changes to respond to COVID and then restore service on Muni routes incrementally over the past year and a half.
We’re excited to relaunch community outreach for the 29 Sunset Improvement Project, starting with a multilingual survey that is both online and over text message. We will also conduct additional outreach to different users of this route including students, service workers and groups that represent seniors and persons with disabilities to help determine priorities that will directly shape a near-term improvement proposal.
As with all Muni Forward projects, the 29 Sunset project will improve reliability of the service by reducing pass-ups and overcrowded buses while mitigating the impacts of traffic congestion. In addition, the project will also consider potential service changes such as a skip stop service for a 29R Sunset Rapid line. We will look to stakeholders to help identify what stops should be considered for 29R service as part of the outreach process and will evaluate design options for feasibility.
A route identified by our Muni Service Equity Strategy, the 29 Sunset is a critical cross-town bus serving the southern and western neighborhoods of San Francisco, as well as major destinations including McLaren Park, City College of San Francisco, San Francisco State University, Golden Gate Park and Baker Beach. Prior to the pandemic, the 29 Sunset served 18,800 daily riders and numerous K-12 schools and universities along its route.
The 29 Sunset serves a significant number of schools along its route
The survey is just our first step. In the coming months, we will conduct broader community outreach, with a focus in the southeastern neighborhoods, which will build upon previous outreach already conducted with schools. Because the agency is faced with limited resources, predicting a timeline for implementation of this project and related changes is difficult. However, we want to design the service now and have it ready to go if/when funding resources become available.
Published August 24, 2021 at 11:11PM
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Then and Now: Keeping the Cable Cars on the Move
By Jeremy Menzies
When Andrew Hallidie’s first cable car climbed Nob Hill on Clay Street in August 1873, the cars were a brand-new technology to replace the horse-drawn streetcars used at the time. Little did he know that 148 years later, cable cars would still be scaling the steep slopes of Nob Hill.
Many of the methods used to maintain and operate the cars to this day harken back to the golden era of cable cars in the late 1800s. As we ramp up for the return of revenue service on San Francisco’s beloved cable cars, check out the images below for a look at just some of the behind-the-scenes work keeping the system running, both then and now.
Keeping up the Cars
Maintaining the cars on a regular basis is vital to keeping them safe, operable and looking good for the tens of thousands of people who ride them. At the Cable Car Division shops, mechanics, carpenters and painters perform routine maintenance, make repairs and brighten up worn out paint to keep the cars in shape.
Then: Two painters work on California Street Cable Car 15 in the paint shop at California Cable headquarters in 1952 (once located on the SW corner of Hyde and California Streets).
Now: A painter lays down masking tape to paint striping on the side of Powell St. Cable Car 22, which was rebuilt in 2017.
Minding the Cable
Without cables and the machinery used to move them, there would be no cable cars. Today the age-old work of cable splicing, a method of attaching one end of the cable to the other, is done by hand, the same as it has been done for over 100 years. Another critical job is maintaining the winding machinery used to move the cable and cars through the streets.
Then: cable splicing in 1947 involved hand tools, skill and a bit of brute force, much the same as 10, 20, or 50 years earlier.
Now: This 2014 shot looks about the same as its 1947 counterpart, minus the hats and cigarettes!
Major Overhauls
When a car is too old or damaged to operate safely, it is rebuilt by teams of skilled craftspeople. The metalworkers in our Special Machine shop are responsible for building new metal parts used throughout the vehicle – from heavy wheel and suspension assemblies to decorative parts of the passenger grab bars. Carpenters rebuild the entire car, while painters and mechanics finish getting the car looking its best and ready to roll.
Then: Two mechanics stop for a photo in 1958 with an overhauled cable car truck in the heavy repair shops once located on Ocean and San Jose avenues (present day location of Muni’s Green Division).
Now: A welder cuts up an old cable car truck using a torch at the Special Machine Shop, which handles building brand new trucks from scratch. In addition to using traditional methods, the shop is truly a 21st century operation with computer-controlled machines that can make parts from technical drawings that were painstakingly uploaded into modern machining software.
Tracks to Run On
Today, as throughout the past 100+ years, track crews are responsible for keeping the track system up and running. Unlike regular rails used in our streetcar and subway systems, the cable car rails include complex pieces to not only guide the cars but also move the cable up and over hills and around bends.
Then: A track crew works to replace a depression beam and bumper bar on Powell Street in this 1971 photo.
Now: In this 2019 shot, a track crew replaces an old depression beam just blocks from the 1971 photo. Depression beams are used to push against the cable to keep it from hitting the channel in which it runs wherever the road dips.
The maintenance and restoration efforts of SFMTA's cable car barn staff speak to their unparalleled background skills and their mastery of age-old trades that help keep our very own national landmark on the move.
Catch a ride on the cable cars for free throughout the month of August and look for them to return to revenue service in September.
Published August 21, 2021 at 06:27AM
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Thanks for Keeping Your Mask On
By Jonathan Streeter
Throughout the COVID-19 pandemic, Muni customers have consistently demonstrated a strong willingness to comply with health safety mandates, in particular with wearing masks. As a reminder, the Federal requirement to wear a mask while riding, boarding and waiting for Muni vehicles remains in place, and has been extended until January 18, 2022.
Everyone over the age of two is required to wear a mask, regardless of vaccination status. We are grateful for the cooperation of everyone involved, as it lowers the risks associated with the spread of the virus, not only for Muni customers, but also for vehicle operators, maintenance crews and others.
If you haven’t already received a vaccination, we encourage you to explore the resources available in San Francisco as well as in other locations.
Thanks for helping to keep your transportation system as safe as we can for everyone.
Published August 19, 2021 at 11:13PM
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Moving Towards San Francisco’s Transportation Future
By Bonnie Jean von Krogh
Transportation is a vital part of a thriving and equitable community and economy. We are planning for a future transportation system to deliver the reliable and safe transit San Franciscans tell us they want, address changes in travel patterns and demographics and improve safety. We also need to address the historical wrongs of inequitable service and long delayed infrastructure repairs.
We have looked at our past and begun charting our future. Transportation in San Francisco is on an unsustainable financial path. We are $50 billion short of the transportation system our city needs over the next 30 years. But we can act now to put San Francisco on a path to success. That’s what Transportation 2050 is about.
Over the last 20 years, the demands on San Francisco’s transportation system have increased while revenues haven’t kept up. The last decade saw tremendous growth in San Francisco and its economy. That strength meant that the SFMTA’s operating revenues met the levels we predicted. Strong growth in the city’s General Fund compensated for the agency’s declining parking and transit fare revenues. Since the SFMTA’s financial structure relies significantly on these declining parking and transit fare revenues, growing costs have resulted in a budget deficit. COVID came along and exacerbated these long-standing budget challenges.
How did we get here? San Francisco has grown and transportation has changed, but how we fund transit and our transportation infrastructure has not. Uber and Lyft have steadily eroded San Francisco's parking revenue, even as we’ve expanded paid parking. Costs to retain reliable, highly qualified bus and rail operators and maintenance staff have increased due to the extraordinarily high costs of living in the Bay Area. Even with this, we have been understaffed for years. Our fare discount programs – critical for keeping Muni affordable – have also meant declining fare revenue.
Now the economic shock and impacts of the COVID-19 pandemic have permanently lowered our revenue projections. At the beginning of the pandemic, we immediately tightened our belts and made $119 million in cuts in a way that prioritized equity. Current federal relief is one-time funding that only keeps transportation afloat in the near term.
With expenditures growing with Bay Area Cost of Living and revenues declining after federal relief is exhausted, the SFMTA faces a funding gap that cannot be closed. It will be years before enterprise revenues recover, leaving the agency on a financial path it cannot recover from alone. A new funding source could get the SFMTA back on track.
Community-Driven Vision
Transportation 2050 is based on transportation needs and priorities identified by the community over the last eight years through two mayoral transportation task forces (T2030 and T2045) and input from the city’s Muni Reliability Working Group in 2020. It outlines the resources needed to achieve the community’s transportation vision developed through ConnectSF, the infrastructure needs identified in the SFMTA’s 20-Year Capital Plan and highlights priorities, post COVID, from the SFMTA’s recent 2021 citywide Community Survey.
Top community priorities include:
- Making our service equitable
- Providing quick, convenient transit access to all parts of San Francisco
- Improving access to public transit for people who are disabled
- Repairing and maintaining Muni equipment and facilities
- Improving service for communities most dependent on transit
- Ensuring that trips to all destinations work well
- Making street safety improvements for walking
Here’s how we're focusing on your priorities and vision:
Addressing the needs of San Francisco’s transportation system will require a total of $111.3 billion over the next 30 years, but the costs to deliver on the complete vision are much higher than our revenues can support. Over the next 10 years, the gap between fully implementing this vision and the financial reality we face is $1.04 billion per year on average. We can get part of the way there, but the SFMTA cannot do it alone. We have used most of the tools in our toolbox.
Transportation 2050 has identified some new potential revenue sources, which combined could amount to $149M per year, beginning the process of recovery on which we can build. These include a transportation special tax, changes to San Francisco’s parking tax, a general obligation bond to fix our infrastructure, advocacy for federal and state grants and revenue from the development of SFMTA properties, the newest tool in the SFMTA toolbox. Combining these new sources with existing funds would allow us to fund nearly 2/3 of the transportation vision for San Francisco over 30 years and put our transportation system on the path to firmer financial footing.
Stay tuned for further updates as we work towards achieving this vision while identifying future revenue streams and cost savings strategies to create an equitable and sustainable transportation system for San Francisco. Learn more on our website SFMTA.com/T2050.
Published August 18, 2021 at 04:01AM
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Powered Scooter Share Program Update
By Philip Cranna
On Friday, August 13, 2021, the SFMTA granted Scoot a permit to operate a shared power scooter share system in San Francisco. Scoot’s permit comes in addition to the two 12-month permits previously granted to Lime and Spin on July 1st.
Scooters are a sustainable mode of travel and a complement to Muni and public transit service. The SFMTA’s Powered Scooter Share Program ensures that shared scooter operations support the City’s recovery in a safe, sustainable, and equitable way. We take seriously permittees’ adherence to the permit terms and conditions, which are crafted to ensure private mobility options best contribute to the public welfare of the City.
SFMTA’s decision on Scoot’s permit
In June 2021, SFMTA temporarily deferred the decision to grant a permit to Scoot in order to investigate their compliance with the 2019 permit terms and conditions after learning that Scoot had been operating with unauthorized and inadequately insured contractors in violation of the 2019 permit program terms.
After taking into consideration this new information, SFMTA staff completed a careful re-evaluation of Scoot's application, and determined that the company has qualified for a permit to operate.
The final application scores for Lime, Spin, and Scoot are all within 1 point of each other, demonstrating that Scoot’s application is comparable to other those of other applicants who were awarded a permit.
Permitted Scooter Operators - Final Scores for the 2021 Permit Application
| Operator | Final Score | Permitted Fleet Size |
| Lime | 78.8 | 2,000 |
| Spin | 78.4 | 2,000 |
| Scoot | 78.2 | 1,500 |
Changes to the Powered Scooter Permit Program
Due to the SFMTA’s findings regarding Scoot’s previous misuse of contractors in operations, we have updated the permit terms and conditions to ensure integrity in maintaining employment best practices. The SFMTA now requires all subcontractors to adhere to the identical labor standards we set for the permitted scooter operators’ in-house staff.
The initial maximum fleet size the SFMTA granted to Scoot will be 1,500 scooters, which is the same fleet size they were granted at the end of the 2019 permit. The SFMTA also granted permittees Lime and Spin each the same maximum fleet size –2,000 scooters—they were allowed at the end of the prior permit period.
As under the 2019 permit, the new permit program limits the maximum possible citywide fleet size at 10,000. Permittees may request fleet size increases in increments of 500 scooters every several months. Fleet size increases will be predicated on compliance with SFMTA-defined metrics and policy outcomes, including those focused on equity, access, and sustainability, as well as adherence to all permit terms and conditions.
Next Steps
The SFMTA plans to closely monitor permittees’ compliance with the updated permit terms and conditions. Additionally, Scoot and all other permittees will be subject to other improvements to the permit previously highlighted in our June 2021 scooter share blog post. We also look forward to further stakeholder collaboration as the Powered Scooter Share Program evolves.
Published August 14, 2021 at 01:47AM
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Jumat, 13 Agustus 2021
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Changes Coming to NextMuni
By Mariana Maguire
When the SFMTA first partnered with NextBus more than twenty years ago to create NextMuni, the real-time transit vehicle arrival predictions system was state-of-the-art and revolutionary for its time. As technology has advanced and our transit system has grown, we are moving to a new system that will best meet the needs of our customers.
Last year, the SFMTA Board of Directors and the Board of Supervisors approved a contract for the Next Generation Customer Information System to replace NextMuni. Set to debut in 2022, the new Customer Information System will focus on improving predictions accuracy, particularly near the beginning of routes, along with several other customer-friendly upgrades. New, larger graphical signs in transit shelters will also feature maps showing the real-time positions of vehicles. These enhancements will help improve the customer experience and make riding transit easier.
While the SFMTA has been working on the Customer Information System initiative, we are still providing customers with the best information possible within the existing NextMuni system's technical limitations. This week, we've made some interim upgrades that will make it easier for customers to navigate around the system and learn about the August 14 service changes.
New NextMuni Improvements
We have optimized NextMuni for the SFMTA website, which means some new conveniences for customers navigating Muni, and important, customer-tested accessibility features:
- Customers can now stay on the SFMTA website for NextMuni predictions
- Arrival predictions are integrated with stop information rather than being in two different places
- For Muni stop information and self-updating predictions, typing SFMTA.com/ followed by the 5-or-6-digit Muni stop ID number takes customers directly to the Muni stop web page with details
- Muni stop pages provide both a vehicle-tracking map and a vicinity map integrated with the predictions and stop information
- Muni stop pages link to nearby transit stops so customers can consider alternative routes
What to Expect During August 14 Service Changes
Whenever the SFMTA implements a large service change, we usually receive many questions about NextMuni. In fact, you may see some lag in NextMuni updates when our next round of service changes goes into effect on August 14. To help explain, here are some answers to frequently asked questions:
Why are predictions sometimes inaccurate after a service change?
For new and restored routes, it usually takes a few days after the service starts for accurate arrival time predictions to begin appearing. This is because the NextMuni software generates predictions based on the vehicle travel times it learns over time. When a line is new or restored, there are no travel time records. Since it's starting from scratch, the software needs a few days’ worth of data to learn travel times and generate more accurate predictions.
Why are arrival time predictions not showing on the NextMuni displays?
Stops near the beginning of routes may not show arrival time predictions. For high-frequency routes, the SFMTA operates "headway-managed" service by maintaining even spacing between vehicles rather than following set time schedules. Stops near the beginning of these routes will not show arrival time predictions unless a vehicle is already on its way. This helps reduce the “ghost bus” phenomenon where the NextMuni sign counts down the time a vehicle arrival but the vehicle never arrives.
Why aren't new or restored routes showing on the NextMuni displays?
New and restored routes must be in service before their information can be loaded into the sign display system. As soon as service starts, NextMuni personnel begin the process of adding routes to the appropriate signs. Once sign configuration is complete, which typically takes a few hours, the NextMuni system is restarted and signs should show the new and restored routes. If you believe a sign is not displaying the correct route, please let us know by contacting 311 or Muni Customer Service at 415.701.2311.
Published August 13, 2021 at 03:35AM
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Transit Access to Jobs Surged with May 2021 Muni Changes
By Tracey Lin
Side by side Graphics from the SFMTA Equity Toolkit showing an increase in job access from January service changes and May service changes for the Excelsior/Ocean View neighborhood.
With the implementation of Muni’s service changes May 15, 2021, and service adjustments made since by regional transit agencies, access to essential jobs via transit has gone up since January 2021, including some significant increases, in all nine neighborhoods identified in the Muni Service Equity Strategy. The Muni Service Equity Strategy focuses on improving transit performance in San Francisco neighborhoods that were selected based on the percentage of households with low incomes (below 200% of the federal poverty level), private vehicle ownership and race and ethnicity demographics.
The Muni service in effect as of May 15, 2021 is the most robust since the Shelter-in-Place order took effect in March of 2020. The reopening of all subway stations improved job access for Muni customers. And, the F Market & Wharves historic streetcar line also returned to service in May, bringing connections to Fisherman’s Wharf, a large employment center.
Over the course of the pandemic, equity neighborhoods overall performed better than more affluent areas in terms of access to jobs via transit. This was the result of deliberate SFMTA planning work to ensure that residents living in equity areas have consistent and improved access to jobs and other critical resources even with significant constraints due to the pandemic.
From January to May 2021, all service equity neighborhoods experienced increases in job access – some by small amounts and some by significant leaps. Here are a few neighborhood snapshots:
Bayview Hunters Point
|
Commute Time |
Access via Transit to Essential Jobs Compared to Pre-Pandemic Service |
||
|
Pre-COVID |
Jan 2021 |
May 2021 |
|
|
30 mins |
100% |
154% |
229% |
|
45 mins |
100% |
126% |
127% |
|
60 mins |
100% |
100% |
100% |
Increases in Bayview-Hunter’s Point to above pre-pandemic levels can be traced to the addition of the community-driven 15 Bayview-Hunters Point Express in January 2021, which connects to downtown. Also, the T Third Street Metro returned to provide rail service to Embarcadero in January. And once the T Third was interlined with the K Ingleside Metro in May, Muni access was expanded even further.
Excelsior and Outer Mission
|
Commute Time |
Access via Transit to Essential Jobs Compared to Pre-Pandemic Service |
||
|
Pre-COVID |
Jan 2021 |
May 2021 |
|
|
30 mins |
100% |
30% |
83% |
|
45 mins |
100% |
62% |
86% |
|
60 mins |
100% |
90% |
95% |
As service has increased, more connections from routes like the 14 Mission, 14R Mission Rapid and 49 Van Ness to downtown likely helped boost job access via transit. With the return of the M Ocean View Metro to Embarcadero and multiple bus routes in August 2021, we expect to see job access further increase.
Oceanview and Ingleside
|
Commute Time |
Access via Transit to Essential Jobs Compared to Pre-Pandemic Service |
||
|
Pre-COVID |
Jan 2021 |
May 2021 |
|
|
30 mins |
100% |
64% |
97% |
|
45 mins |
100% |
22% |
71% |
|
60 mins |
100% |
58% |
95% |
As mentioned above, in May, the K Ingleside and T Third lines were interlined into the KT Ingleside-Third, which allows for increased service between Balboa Park and Sunnydale.
Other neighborhoods experienced more modest, but still consistent, increases in job access. Neighborhoods like Western Addition and the Tenderloin are more centrally located near several key routes that were part of Muni’s original 17-route COVID-19 Muni Core Service Network, like the 5 Fulton, 22 Fillmore, 38 Geary and 38R Geary Rapid, as well as cross-town and connector routes that were steadily added back into service.
Western Addition
|
Commute Time |
Access via Transit to Essential Jobs Compared to Pre-Pandemic Service |
||
|
Pre-COVID |
Jan 2021 |
May 2021 |
|
|
30 mins |
100% |
94% |
94% |
|
45 mins |
100% |
94% |
96% |
|
60 mins |
100% |
94% |
95% |
Tenderloin
|
Commute Time |
Access via Transit to Essential Jobs Compared to Pre-Pandemic Service |
||
|
Pre-COVID |
Jan 2021 |
May 2021 |
|
|
30 mins |
100% |
91% |
94% |
|
45 mins |
100% |
94% |
95% |
|
60 mins |
100% |
96% |
96% |
Learn more about the SFMTA’s Equity Toolkit and explore the Toolkit in ArcGIS. We are encouraged to see how service changes have made a difference for our customers and recognize that there are still more improvements to be made to increase job access via Muni from service equity neighborhoods. Additional service changes are coming August 14, which are anticipated to further expand access to essential jobs. Stay tuned for our next analysis!
Published August 11, 2021 at 05:43AM
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